yapf requires toml

.github/workflows/linting.yml

@@ -50,7 +50,7 @@ jobs:
     - name: Install yapf
       run: |
         python -m pip install --upgrade pip
-        pip install yapf==0.32
+        pip install yapf==0.32 toml
     - name: Run yapf
       run: |
         yapf . --diff --recursive