dovecot: upgrade 2.3.20 -> 2.3.21

Changelog:
==========
* lib-oauth2: Allow JWT tokens to be validated with missing typ field.
+ auth: Auth passdb and userdb reply can contain "event_<name>=value"
  which will be added to login event and mail user event respectively.
+ lib-master: Set process title during various initialization stages to
  clearly describe what the process is waiting on.
+ lib-storage: The mail_temp_scan_interval is now fuzzed incrementing it
  by 0..30% based on username's hash to reduce the chance of load spikes.
+ lib-storage: The temp file scan has been moved from the open of the
  mailbox to the close, to reduce the latency perceived by users.
+ stats: If metric has fields specified, all these fields are
  exported as counters to prometheus exposition.
- *-login: Processes might have crashed when a SSL connection disconnects
  uncleanly.
- acl: When plugin was loaded \HasChildren and \HasNoChildren flags
  were calculated incorrectly for mailboxes containing '*' and '%'
  in their names.
- auth: Crash occured if a connection to PostgreSQL database server
  failed during startup.
- auth: Logins with invalid passwords (e.g. unknown scheme) in passdb
  were failing with "password mismatch" instead of "internal error".
- auth: XOAUTH2 and OAUTHBEARER mechanisms were not giving out protocol
  specific error message on all errors. This especially broke OIDC
  discovery.
- dbox: When last_temp_file_scan header wasn't set (especially after
  dsync migration), the next mailbox open always triggers the temp file
  scan.
- dict-redis: A crash would occur on transaction rollback.
- dsync: Infinite loop causing out of memory would occur when handling
  mailbox deletion from remote end and hierarchy separators would differ.
- dsync: Incremental dsync failed for folder names ending with '%',
  unless BROKENCHAR was set. Also folder names with '%' elsewhere in
  them caused each incremental dsync to unnecessarily rename the folder
  to a temporary name and back. v2.3.19 regression.
- imap-hibernate: If an IMAP client unhibernation timed out with
  "(version received)", the unhibernation could still have successfully
  finished later on and continued working normally. This was rather
  confusing, because imap-hibernate already logged that the client got
  disconnected.
- imapc: Crashed when a folder mapped through the virtual plugin
  disappears from the storage.
- imapc: EXPUNGE, EXISTS or FETCH replies from a server for a previously
  selected mailbox could have been processed as if they belonged to the
  new mailbox currently being selected.
- lib-http: Dovecot HTTP server (doveadm, stats/openmetrics) may have
  disconnected HTTP clients before the response is fully sent. This
  happened only on busy servers where kernel's socket buffers were
  rather full.
- lib-http: Fixed a potential crash on http-server if a client
  disconnected early. v2.3.18 regression.
- lib-index: Index file corruption could have caused a crash. Fixes:
  Panic: file mail-transaction-log-view.c: line 165 (mail_transaction_log_view_set):
  assertion failed: (min_file_seq <= max_file_seq).
- lib-index: Purging an existing >1GB cache file can crash. Now cache
  files still above 1GB after purging are removed. Fixes:
  Panic: file mail-index-util.c: line 10 (mail_index_uint32_to_offset):
  assertion failed: (offset < 0x40000000)
- lib-lua: A HTTP client could not resolve DNS names in mail processes,
  because it expected "the dns-client" socket to exist in the current
  directory.
- lib-oauth2: Dovecot would send client_id and client_secret as POST
  parameters to the introspection server. These need to be optionally in
  Basic auth instead.
- lib-oauth2: JWT aud validation was not performed if aud was missing
  from a token, but was configured on Dovecot.
- lib-oauth2: JWT key type check was too strict.
- lib-oauth2: JWT token audience was not validated against client_id as
  required by the specification.
- lib-ssl-iostream: Using the ssl_require_crl=yes setting may have caused
  CRL check failures for outgoing SSL/TLS connections, although it was
  supposed to affect checking CRLs only for client-side SSL
  certificates. v2.3.17 regression.
- lib-sql: MySQL driver leaked memory when connection failed.
- lib-storage: Various fixes when running into out of disk space.
- master: Service idle_kill setting didn't work properly on busy
  servers.
- mdbox: Temp file scan was done for always empty directories.
- mdbox: The fdatasync() call was done in wrong parent directory when
  writing mails. Also on a failure it crashed instead of logging an error.
- notify_status: The plugin crashes if any user initialization fails.
- pop3: Sending command with the ':' character caused an assert-crash.
  v2.3.18 regression. Fixes: Panic: event_reason_code_prefix(): name has ':'
- stats: Fix panic when a nonexistent event exporter was referenced while
  adding a new metric dynamically via doveadm stats add.
- stats: If process exported a lot of events and then exited, some of
  the last events may have become lost.
- stats: Invalid Prometheus label names were created with specific
  histogram group_by configurations. Prometheus rejected these labels.
- welcome: The plugin didn't execute in some situations that created
  INBOX but didn't open it.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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