Bump actions/cache from 4 to 5

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/check-examples.yml

@@ -65,7 +65,7 @@ jobs:
           echo "hash=$hash" >> $GITHUB_OUTPUT
 
       - name: Restore server cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: pokemon-showdown/node_modules
           key: showdown-python${{ matrix.version }}-${{ steps.showdown-hash.outputs.hash }}

.github/workflows/nightly.yml

@@ -45,7 +45,7 @@ jobs:
           echo "hash=$hash" >> $GITHUB_OUTPUT
 
       - name: Restore server cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: pokemon-showdown/node_modules
           key: showdown-python${{ matrix.version }}-${{ steps.showdown-hash.outputs.hash }}

.github/workflows/tests.yml

@@ -79,7 +79,7 @@ jobs:
           echo "hash=$hash" >> $GITHUB_OUTPUT
 
       - name: Restore server cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: pokemon-showdown/node_modules
           key: showdown-python${{ matrix.version }}-${{ steps.showdown-hash.outputs.hash }}