chore(deps): update https://github.com/microsoft/vcpkg digest to f9ffbaa #634

Job	Run time
pre-commit	3m 21s
check • x64-linux • gcc-14 • c++20 • RelWithDebInfo	2m 25s
check • x64-linux • gcc-14 • c++20 • Debug	2m 20s
check • x64-linux • llvm-18 • c++20 • Debug	2m 35s
check • x64-windows • msvc-2022 • c++20 • RelWithDebInfo	1m 39s
clang-tidy	2m 40s
check • x64-windows • msvc-2022 • c++20 • Debug	1s
check • x64-mingw-dynamic • mingw • c++20 • Debug	4m 45s
check • x64-mingw-dynamic • mingw • c++20 • RelWithDebInfo	7m 0s
check • x64-linux • llvm-18 • c++20 • RelWithDebInfo	1m 10s
check • x64-windows • llvm-18 • c++20 • Debug	1m 42s
check • sanitizers • address,undefined • Debug	56s
cppcheck	58s
check • valgrind • RelWithDebInfo	1m 6s
check • sanitizers • address,undefined • RelWithDebInfo	1m 20s
codecov	1m 8s
check • x64-windows • llvm-18 • c++20 • RelWithDebInfo	2m 0s
check-docs	3m 3s
check • ${{ matrix.triplet }} • ${{ matrix.compiler }} • c++${{ matrix.std }} • ${{ matrix.build_type }}	-1s
check • valgrind • Debug	1m 12s
pass	5s
	41m 25s

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