stubtest unused: match stubtest version, add fix (#4705)

In #4696 I bumped stubtest to a commit that hasn't been released. We
should have these stubtest versions match. In
https://github.com/python/mypy/pull/9426 I changed the output of
stubtest here; it's good to get this change in before I forget and this
action silently stops working.

Co-authored-by: hauntsaninja <>

.github/workflows/stubtest-unused-whitelist.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install -U pip
-          pip install -U mypy==0.790
+          pip install -U git+git://github.com/python/mypy@af3c8be98f
       - name: Run stubtest
         shell: bash
         run: ./tests/stubtest_unused.py | tee stubtest-output-${{ matrix.os }}-${{ matrix.python-version }} || true