Update action deps, add dependabot config

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/retrobar.yml

@@ -18,12 +18,12 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 0
 
     - name: Install nbgv
-      uses: dotnet/[email protected].0
+      uses: dotnet/[email protected].1
 
     - name: Publish app
       run: dotnet publish -p:PublishProfile=$env:Profile -f $env:Framework
@@ -35,7 +35,7 @@ jobs:
       run: cp DistLicense.txt RetroBar\bin\Release\${{ matrix.publishprofile[1] }}\publish-${{ matrix.publishprofile[0] }}\License.txt
 
     - name: Upload build artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: RetroBar ${{ matrix.publishprofile[0] == 'x86' && '32-bit' || matrix.publishprofile[0] == 'x64' && '64-bit' || 'ARM64' }}
         path: |