Install types packages manually.

.github/workflows/pythonpackage.yml

@@ -46,8 +46,7 @@ jobs:
       if: "matrix.os != 'windows-latest' && matrix.python-version != 'pypy3'"
     - name: Install mypy
       run: |
-        pip install -U mypy
-        python -m mypy --install-types --incremental
+        pip install -U mypy types-paramiko types-certifi
       if: "matrix.python-version != 'pypy3'"
     - name: Style checks
       run: |