Add `CHANGELOG.md` entry for 5.13.1 (#8370) #315

Job	Run time
check_code_style	23s
check_libraries_manifest	6s
build_linux (Release, ubuntu-20.04)	1h 1m 51s
build_macos (Release, x86_64, macos-14)	35m 23s
build_linux (RelWithDebInfo, ubuntu-20.04)	52m 45s
check_genwebsitejson	4s
build_macos (Release, arm64, macos-14)	1h 5m 57s
build_windows (Release, 64, windows-2019)	1h 20m 58s
build_linux (Debug, ubuntu-20.04)	59m 47s
build_macos (Debug, x86_64, macos-14)	39m 54s
build_windows (Release, arm64, windows-2019)	52m 42s
build_macos (Debug, arm64, macos-14)	1h 13m 35s
check_source_code (ubuntu-20.04)	7m 24s
test_macos_monterey	2h 11m 19s
build_universal_macos_artifacts	1m 7s
mergeable	1s
	11h 3m 16s

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