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

@@ -20,17 +20,17 @@ jobs:
       - name: Checkout Git repository
         uses: actions/checkout@master
       - name: Cache cargo registry
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cargo/registry
           key: ${{runner.os}}-cargo-registry-${{hashFiles('**/Cargo.lock')}}
       - name: Cache cargo index
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cargo/git
           key: ${{runner.os}}-cargo-index-${{hashFiles('**/Cargo.lock')}}
       - name: Cache cargo build
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: target
           key: ${{runner.os}}-cargo-build-target-${{hashFiles('**/Cargo.lock')}}