chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
           dotnet-version: ${{ env.DOTNET_VERSION }}
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v5
         with:
           path: paket-cache
           key: ${{ runner.os }}-paket-${{ hashFiles('paket.lock') }}