Adds changelog for 12.1.3 #6411

Job	Run time
get_postgres_versions_from_file	6s
rpm_build_tests (oraclelinux-8, 14)	2m 7s
deb_build_tests (debian-buster-all, 14)	1m 58s
rpm_build_tests (oraclelinux-8, 15)	2m 4s
deb_build_tests (debian-buster-all, 15)	2m 1s
rpm_build_tests (oraclelinux-8, 16)	1m 58s
deb_build_tests (debian-buster-all, 16)	2m 3s
rpm_build_tests (almalinux-8, 14)	2m 1s
deb_build_tests (debian-bookworm-all, 14)	2m 14s
rpm_build_tests (almalinux-8, 15)	1m 57s
deb_build_tests (debian-bookworm-all, 15)	2m 9s
rpm_build_tests (almalinux-8, 16)	1m 58s
deb_build_tests (debian-bookworm-all, 16)	2m 11s
rpm_build_tests (almalinux-9, 14)	2m 4s
deb_build_tests (debian-bullseye-all, 14)	2m 3s
rpm_build_tests (almalinux-9, 15)	1m 57s
deb_build_tests (debian-bullseye-all, 15)	2m 3s
rpm_build_tests (almalinux-9, 16)	2m 0s
deb_build_tests (debian-bullseye-all, 16)	2m 3s
rpm_build_tests (centos-7, 14)	1m 57s
deb_build_tests (ubuntu-focal-all, 14)	1m 59s
rpm_build_tests (centos-7, 15)	1m 48s
deb_build_tests (ubuntu-focal-all, 15)	1m 59s
rpm_build_tests (oraclelinux-7, 14)	1m 55s
rpm_build_tests (oraclelinux-7, 15)	2m 1s
deb_build_tests (ubuntu-focal-all, 16)	1m 59s
deb_build_tests (ubuntu-jammy-all, 14)	2m 22s
deb_build_tests (ubuntu-jammy-all, 15)	2m 15s
deb_build_tests (ubuntu-jammy-all, 16)	2m 18s
	57m 30s

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