Bump martincostello/update-dotnet-sdk from 3.3.0 to 3.4.0 (#995)

Author: dependabot[bot]

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

@@ -21,7 +21,7 @@ permissions:
 jobs:
   update-sdk:
     name: Update .NET SDK
-    uses: martincostello/update-dotnet-sdk/.github/workflows/update-dotnet-sdk.yml@0bc908ef15be678a94bc7bf92f742bbaff67337e # v3.3.0
+    uses: martincostello/update-dotnet-sdk/.github/workflows/update-dotnet-sdk.yml@76e2c0df2303d4f6a404228105ebb7d60ace0556 # v3.4.0
     permissions:
       contents: write
       pull-requests: write