Bump actions/cache from 3.2.4 to 3.2.6

Bumps [actions/cache](https://github.com/actions/cache) from 3.2.4 to 3.2.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3.2.4...v3.2.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/[email protected].4
+      - uses: actions/[email protected].6
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
@@ -113,7 +113,7 @@ jobs:
       - uses: actions/download-artifact@v3
         with:
           name: build-manifest
-      - uses: actions/[email protected].4
+      - uses: actions/[email protected].6
         with:
           path: ./rubies
           key: ${{ matrix.entry.rubies_cache_key }}