Bump actions/cache from 3 to 4 (#60)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -35,7 +35,7 @@ jobs:
       - uses: actions/configure-pages@v4
         id: configure
       - name: cache flutter
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           key: ${{ runner.os }}-${{ hashFiles('**/.fvm/fvm_config.json') }}
           path: .fvm/cache

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
           distribution: "temurin"
           java-version: "11"
       - name: cache flutter
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           key: ${{ runner.os }}-${{ hashFiles('**/.fvm/fvm_config.json') }}
           path: .fvm/cache