python3-dnspython: Upgrade 2.0.0 -> 2.1.0

Upgrade to release 2.1.0:

- End-of-line comments are now associated with rdata when read
  from text. For backwards compatibility with prior versions of
  dnspython, they are only emitted in to_text() when requested.
- Synchronous I/O is a bit more efficient, as we now try the I/O
  and only use poll() or select() if the I/O would block.
- The resolver cache classes now offer basic hit and miss
  statistics, and the LRUCache can also provide hits for every
  cache key.
- The resolver has a canonical_name() method.
- There is now a registration mechanism for EDNS option types.
- The default EDNS payload size has changed from 1280 to 1232.
- The SVCB, HTTPS, and SMIMEA RR types are now supported.
- TSIG has been enhanced with TKEY and GSS-TSIG support. Thanks
  to Nick Hall for writing this.
- Zones now can be updated via transactions.
- A new zone subclass, dns.versioned.Zone is available which has
  a thread-safe transaction implementation and support for keeping
  many versions of a zone.
- The zone file reading code has been adapted to use transactions,
  and is now a public API.
- Inbound zone transfer support has been rewritten and is available
  as dns.query.inbound_xfr() and dns.asyncquery.inbound_xfr(). It
  uses the transaction mechanism, and fully supports IXFR and AXFR.

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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