Bump actions/cache from 2 to 3 (#2915)

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v2...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/elixir.yml

@@ -52,7 +52,7 @@ jobs:
           elixir-version: ${{steps.versions.outputs.elixir}}
           otp-version: ${{ steps.versions.outputs.erlang}}
       - name: Restore dependencies cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             deps

.github/workflows/publish-docs.yml

@@ -35,7 +35,7 @@ jobs:
           otp-version: ${{ steps.versions.outputs.erlang}}
 
       - name: Restore Elixir dependencies cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             deps