libcoap: upgrade 4.3.1 -> 4.3.3

License-Update:
 Copyright: Update copyright date to end 2023 as appropriate
 Add in OSCORE support
 RIOT: Update to support latest libcoap code
 Add BSD-3-Clause

Changelog:
===========
* Source files reformatted according to pre-commit rules.
* Support for RFC8613 (OSCORE).
* Support for RFC8974 (Extended Tokens).
* Support for RFC9177 (Q-Block).
* Support for latest RIOT code and new examples.
* Support for MinGW builds.
* Support for AF_UNIX sockets.
* Support for WebSockets (RFC8323).
* Support for IPv4 only and IPv6 only libcoap builds.
* Support for defining maximum logging level.
* Support for maintaining Observer requests over server restarts.
* Support for Contiki-NG.
* Support for latest LwIP, including using TinyDTLS.
* libcoap now has protocol layered support, separating out the
  logical layers. Stack now is:-
    - Application
    - libcoap - CoAP
    - libcoap - CoAP-Session
    - libcoap - (D)TLS I/F using external (D)TLS Library
    - libcoap - Netif
    - libcoap - Sockets
    - Kernel Network Stack
* Fixes CVE-2023-30362 and CVE-2023-35862.
* Reported bugs fixed.
* Examples now support separate logging levels for libcoap and (D)TLS.
* syslog LOG_ logging levels replaced with COAP_LOG_ logging levels.
* New public API functions to aid / reduce application coding.
* Remove requirement for applications to have sockaddr knowledge.
* Support for clients sending IPv4 broadcast requests.
* Documentation added and updated (Doxygen and man).
* Fix ABI version.

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

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