Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
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/test.yml

@@ -29,13 +29,13 @@ jobs:
         otp-version: ${{ matrix.otp }}
 
     - name: Get deps cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: deps/
         key: deps-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}
 
     - name: Get build cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: _build/test/
         key: build-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}
@@ -56,7 +56,7 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Retrieve PLT Cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: plt-cache
       with:
         path: priv/plts