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] <[email protected]>

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         elixir-version: ${{matrix.pair.elixir-version}}
         otp-version: ${{matrix.pair.otp-version}}
     - name: Restore elixir dependencies cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: deps
         key: ${{runner.os}}-mix-${{matrix.elixir-version}}-${{matrix.otp-version}}-${{hashFiles('**/mix.lock')}}

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
         elixir-version: ${{matrix.pair.elixir-version}}
         otp-version: ${{matrix.pair.otp-version}}
     - name: Restore elixir dependencies cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: deps
         key: ${{runner.os}}-mix-${{matrix.elixir-version}}-${{matrix.otp-version}}-${{hashFiles('**/mix.lock')}}