Bump actions/cache from 2 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...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

@@ -73,7 +73,7 @@ jobs:
   #         components: rustfmt
   #         default: true
 
-  #     - uses: actions/cache@v2
+  #     - uses: actions/cache@v4
   #       with:
   #         path: |
   #           ~/.cargo/bin/
@@ -200,7 +200,7 @@ jobs:
           distribution: "temurin"
           java-version: "17"
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/bin/
@@ -238,7 +238,7 @@ jobs:
           args: --features all --all
 
       - name: Cache venv
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pypoetry/virtualenvs
           key: ${{ runner.os }}-venv-${{ secrets.CACHE_VERSION }}-${{ hashFiles('connectorx-python/poetry.lock') }}