build(deps): bump actions/cache from 5 to 6 (#5231)

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/unit_tests.yml

@@ -73,7 +73,7 @@ jobs:
     - uses: actions/checkout@v7
     - uses: ./.github/workflows/composite/setup
     - name: Restore parallel_rspec runtime logs
-      uses: actions/cache/restore@v5
+      uses: actions/cache/restore@v6
       with:
         path: tmp/parallel_runtime_rspec_*.log
         key: parallel-runtime-postgres-${{ matrix.image }}-${{ github.run_id }}
@@ -84,7 +84,7 @@ jobs:
       run: DB=postgres POSTGRES_CONNECTION_PREFIX="postgres://postgres:rootpassword@localhost:5432" RSPEC_PROFILE="${{ inputs.rspec_profile }}" bundle exec rake spec
     - name: Save parallel_rspec runtime logs
       if: always() && github.ref == 'refs/heads/main'
-      uses: actions/cache/save@v5
+      uses: actions/cache/save@v6
       with:
         path: tmp/parallel_runtime_rspec_*.log
         key: parallel-runtime-postgres-${{ matrix.image }}-${{ github.run_id }}
@@ -127,7 +127,7 @@ jobs:
     - uses: actions/checkout@v7
     - uses: ./.github/workflows/composite/setup
     - name: Restore parallel_rspec runtime logs
-      uses: actions/cache/restore@v5
+      uses: actions/cache/restore@v6
       with:
         path: tmp/parallel_runtime_rspec_*.log
         key: parallel-runtime-mysql-${{ matrix.image }}-${{ github.run_id }}
@@ -138,7 +138,7 @@ jobs:
       run: DB=mysql MYSQL_CONNECTION_PREFIX="mysql2://root:password@127.0.0.1:3306" RSPEC_PROFILE="${{ inputs.rspec_profile }}" bundle exec rake spec
     - name: Save parallel_rspec runtime logs
       if: always() && github.ref == 'refs/heads/main'
-      uses: actions/cache/save@v5
+      uses: actions/cache/save@v6
       with:
         path: tmp/parallel_runtime_rspec_*.log
         key: parallel-runtime-mysql-${{ matrix.image }}-${{ github.run_id }}