Remove dub upgrade while it is broken.

Author: schveiguy

.github/workflows/dub.yml

@@ -39,7 +39,8 @@ jobs:
           compiler: ${{ matrix.compiler }}
 
       - name: Upgrade dub dependencies
-        uses: WebFreak001/dub-upgrade@v0.1.1
+        # Broken, try without it for now.
+        # uses: WebFreak001/dub-upgrade@v0.1.1
 
       - name: Build Library
         run: dub build --build=release --config=library