Mark Constant Fields as `final` #8271

Job	Run time
build-windows-macos (windows-latest, 21, -x doctest -PbuildPlatform=windows)	23m 7s
build-windows-macos (macos-13, 21)	41m 52s
Get-CI-Image-Tag / Get-CI-Image-Tag	7s
bwc-tests (21)	7m 2s
build-linux (21)	31m 9s
	1h 43m 17s

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