[icu] force absolute path on install script. - #52618

After committing all other changes, the version database must be updated. This can be done by running the following commands: PowerShell ```powershell git fetch https://github.com/microsoft/vcpkg master $merge_base = git merge-base HEAD FETCH_HEAD git restore --source=$merge_base --staged --worktree -- versions git clean -fd -- versions ./vcpkg x-add-version --all ``` bash ```bash git fetch https://github.com/microsoft/vcpkg master merge_base="$(git merge-base HEAD FETCH_HEAD)" git restore --source="$merge_base" --staged --worktree -- versions git clean -fd -- versions ./vcpkg x-add-version --all ```