chore(deps): update https://github.com/microsoft/vcpkg digest to f9ffbaa #632

Job	Run time
pre-commit	15s
check • x64-linux • llvm-18 • c++20 • RelWithDebInfo	3m 1s
check • x64-linux • gcc-14 • c++20 • RelWithDebInfo	3m 8s
check • x64-linux • gcc-14 • c++20 • Debug	3m 1s
check • x64-linux • llvm-18 • c++20 • Debug	2m 59s
check • x64-windows • llvm-18 • c++20 • Debug	2m 12s
check • x64-windows • msvc-2022 • c++20 • Debug	2m 10s
check • x64-windows • llvm-18 • c++20 • RelWithDebInfo	2m 14s
clang-tidy	4m 1s
cppcheck	5m 15s
check • x64-windows • msvc-2022 • c++20 • RelWithDebInfo	1s
check-docs	5m 28s
check • valgrind • Debug	2m 40s
check • valgrind • RelWithDebInfo	3m 26s
check • x64-mingw-dynamic • mingw • c++20 • Debug	5m 45s
check • sanitizers • address,undefined • RelWithDebInfo	2m 42s
codecov	7m 11s
check • sanitizers • address,undefined • Debug	3m 41s
check • x64-mingw-dynamic • mingw • c++20 • RelWithDebInfo	4m 57s
check • ${{ matrix.triplet }} • ${{ matrix.compiler }} • c++${{ matrix.std }} • ${{ matrix.build_type }}	0s
pass	3s
	1h 4m 10s

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