Bump actions/checkout from 2 to 3 (#2311)

Author: dependabot[bot]

.github/workflows/default_plugins.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup .NET
         uses: actions/setup-dotnet@v1
         with: