Bump martincostello/update-dotnet-sdk from 3.8.3 to 4.0.0 (#319)

Author: dependabot[bot]

.github/workflows/update-dotnet-sdk.yml

@@ -19,7 +19,7 @@ permissions: {}
 jobs:
   update-sdk:
     name: Update .NET SDK
-    uses: martincostello/update-dotnet-sdk/.github/workflows/update-dotnet-sdk.yml@a56c6d7f553ce7cacfaae732159694894268742c # v3.8.3
+    uses: martincostello/update-dotnet-sdk/.github/workflows/update-dotnet-sdk.yml@b4a65696fa41bbe5a4ddf75b7da0e204d7343dc7 # v4.0.0
     permissions:
       contents: write
       pull-requests: write