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update changelog for 51.12 #5857

Job	Run time
docs / Build linux64	1m 24s
lint / lint	1m 15s
test / Linux gcc-10 / Build linux64	6m 23s
test / Linux gcc-12 / Build linux64	8m 6s
test / Windows MSVC / Build win64	6h 0m 15s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	28s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	21s
test / Run Windows test suite (empty config)	0s
test / Run Windows test suite	0s
	6h 18m 12s

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