Workflow tweak (#36)

Removed redundant fetch, as the checkout@v4 action already fetches the complete repo history.

.github/workflows/ci.yml

@@ -21,14 +21,6 @@ jobs:
       with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
      
-    - name: Fetch all history for all tags and branches
-      run: |
-        if [ -f "$(git rev-parse --git-dir)/shallow" ]; then
-          git fetch --prune --unshallow
-        else
-          echo "Repository is already complete."
-        fi 
-      
     - name: Setup .NET
       uses: actions/setup-dotnet@v2
       with: