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](https://github.com/actions/cache/compare/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>

.github/workflows/ci.yml

@@ -105,7 +105,7 @@ jobs:
 
       - name: Cache PostGIS Docker image
         id: postgis-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /tmp/postgis-image.tar
           key: postgis-16-3.4
@@ -143,7 +143,7 @@ jobs:
 
       - name: Build and cache BRouter
         id: brouter-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /tmp/brouter
           key: brouter-1.7.8
@@ -157,7 +157,7 @@ jobs:
 
       - name: Cache BRouter segment
         id: segment-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /tmp/brouter-segments
           key: brouter-segment-E10_N50
@@ -187,7 +187,7 @@ jobs:
 
       - name: Cache Playwright browsers
         id: playwright-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/ms-playwright
           key: playwright-${{ hashFiles('pnpm-lock.yaml') }}