Update actions/cache action to v5 (#359)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         with:
           dotnet-version: '10.0.x'
       - name: 'Cache: .nuke/temp, ~/.nuget/packages'
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             .nuke/temp