Bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/rustLaunchSite.yml

@@ -141,7 +141,7 @@ jobs:
       # note that build type isn't considered in the cache key, because I now
       #  force use of release-flavored dependencies
       - name: Setup vcpkg (1/4)
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           key:
             # only hash on files present without configure/build
@@ -199,7 +199,7 @@ jobs:
       # save cache if warranted
       - name: Update vcpkg cache (2/2)
         if: ${{ steps.cache_vcpkg.outputs.CHECK_OUTPUT == 'true' }}
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           key:
             # only hash on files present without configure/build