Feature Request: --abi-tools-use-exact-versions should also consider the version of the vcpkg-tool it self.

[petersteneteg]

Since the hash of the vcpkg-tool is included in the ABI hash, one needs to use the same version of the vcpkg-tool for caching to work.
abi-tools-use-exact-versions was introduced to handle this for external tools like cmake etc, It should also handle this for the vcpkg tool it self.

Ideally it should auto update the vcpkg-tool, otherwise giving and error and requesting the user to run bootstrap.