Update dotnet.yml

Author: iscifoni

.github/workflows/dotnet.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Install GitVersion
         uses: gittools/actions/gitversion/setup@v0.9.7
         with:
-          versionSpec: '5.1.x'
+          versionSpec: '5.x'
       - name: Use GitVersion
         id: gitversion # step id used as reference for output values
         uses: gittools/actions/gitversion/execute@v0.9.7