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update changelog for 51.12 #5858

Job	Run time
docs / Build linux64	1m 14s
lint / lint	23s
test / Windows MSVC / Build win64	22m 39s
test / Linux gcc-10 / Build linux64	6m 2s
test / Linux gcc-12 / Build linux64	8m 16s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	21s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	20s
test / Run Windows test suite	0s
test / Run Windows test suite (empty config)	0s
	39m 15s

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