chore(deps): 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

@@ -55,7 +55,7 @@ jobs:
 
       - name: Cache deps
         id: cache-deps
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: cache-elixir-deps
         with:
@@ -66,7 +66,7 @@ jobs:
 
       - name: Cache compiled build
         id: cache-build
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: cache-compiled-build
         with:
@@ -78,7 +78,7 @@ jobs:
 
       # Don't cache PLTs based on mix.lock hash, as Dialyzer can incrementally update even old ones
       - name: Cache PLT
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: plt_cache
         with:
           path: priv/plts