cache nuget packages in the dotnet.yml action

.github/workflows/dotnet.yml

@@ -29,6 +29,8 @@ jobs:
             uses: actions/setup-dotnet@v4
             with:
               dotnet-version: 9.0.x
+              cache: true    
+              cache-dependency-path: "**/packages.lock.json"
 
           - name: Is Tag Build
             if: startsWith(github.ref, 'refs/tags/')
@@ -39,7 +41,7 @@ jobs:
             run: echo "Suffix=$(date +'%Y%m%d')-${{ github.run_number }}" >> $GITHUB_ENV
 
           - name: Restore
-            run: dotnet restore ./Discord.Net.sln -v minimal
+            run: dotnet restore ./Discord.Net.sln -v minimal --locked-mode /p:RestorePackagesWithLockFile=true
 
           - name: Build
             run: dotnet build "Discord.Net.sln" -v minimal -c Release --no-restore /p:BuildNumber=${{ env.Suffix }} /p:IsTagBuild=${{ env.IsTagBuild }}