git-credential-manager: update to 2.7.0 #565

Job	Run time
determine-packages	6s
build-packages (mingw-w64-git-credential-manager, x86_64, windows-latest)	1m 57s
build-packages (mingw-w64-git-credential-manager, aarch64, windows-11-arm)	3m 41s
check-for-missing-dlls	-1s
build-artifacts	-1s
sdk-artifacts	-1s
	5m 41s

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