build(deps): bump actions/cache from 4 to 5 (#772)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  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/pull_request.yml

@@ -244,7 +244,7 @@ jobs:
       - name: Prepare CI Environment
         uses: ./.github/actions/prepare_env
       - name: Cache sample .build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         continue-on-error: true
         with:
           path: Samples/${{ matrix.sample_app }}/.build
@@ -283,7 +283,7 @@ jobs:
         env:
           SWIFT_VERSION: "${{ matrix.swift_version }}"
       - name: Cache sample .build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         continue-on-error: true
         with:
           path: Samples/${{ matrix.sample_app }}/.build