Fix minor in versionSpec for GitVersion

Author: mburumaxwell

.github/workflows/build.yml

@@ -50,7 +50,7 @@ jobs:
     - name: Install GitVersion
       uses: gittools/actions/gitversion/setup@v3
       with:
-        versionSpec: '6.x'
+        versionSpec: '6.0.x'
 
     - name: Determine Version
       uses: gittools/actions/gitversion/execute@v3