Bump actions/cache from 2.1.7 to 3

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.7 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.7...v3)

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

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

.github/workflows/diff_shades.yml

@@ -68,7 +68,7 @@ jobs:
 
       - name: Attempt to use cached baseline analysis
         id: baseline-cache
-        uses: actions/cache@v2.1.7
+        uses: actions/cache@v3
         with:
           path: ${{ matrix.baseline-analysis }}
           key: ${{ matrix.baseline-cache-key }}