Merge tag '20.8.1' into 'merge-asterisk-20.8.1'

Asterisk uplift for openwrt_telephony 23.05.4

Conflicts resolved:

CONFLICT (content): Merge conflict in channels/chan_pjsip.c
CONFLICT (content): Merge conflict in main/logger.c
CONFLICT (content): Merge conflict in res/res_pjsip_endpoint_identifier_ip.c
CONFLICT (content): Merge conflict in sounds/Makefile