[ci] last resort

while looking for fix to https://twitter.com/julien_c/status/1237864185821708291

.github/workflows/self-push.yml

@@ -31,6 +31,7 @@ jobs:
       run: |
         source .env/bin/activate
         pip install .[sklearn,tf,torch,testing]
+        pip uninstall -y tensorflow
 
     - name: Are GPUs recognized by our DL frameworks
       run: |