Bump actions/cache from 3 to 4 (#295)

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

.github/workflows/part_docs.yml

@@ -27,7 +27,7 @@ jobs:
           php-version: "8.3"
           tools: phive
       - name: Cache Tools
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache
         with:
           path: ~/.phive

.github/workflows/part_test.yml

@@ -48,7 +48,7 @@ jobs:
         if: "${{ runner.os == 'Windows' }}"
         run: echo "dir=$(composer config cache-files-dir)" >> $env:GITHUB_OUTPUT
       - name: Cache Deps
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache
         with:
           path: ${{ steps.composer-cache-common.outputs.dir }}${{ steps.composer-cache-windows.outputs.dir }}
@@ -105,7 +105,7 @@ jobs:
         id: composer-cache
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
       - name: Cache Deps
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
@@ -137,7 +137,7 @@ jobs:
         id: composer-cache
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
       - name: Cache Deps
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache
         with:
           path: ${{ steps.composer-cache.outputs.dir }}