Make mypy happy.

src/allmydata/storage/http_server.py

@@ -552,12 +552,12 @@ def listen_tls(
             host=hostname,
             port=listening_port.getHost().port,
             path=(str(server._swissnum, "ascii"),),
-            userinfo=[
+            userinfo=(
                 str(
                     get_spki_hash(load_pem_x509_certificate(cert_path.read_bytes())),
                     "ascii",
-                )
-            ],
+                ),
+            ),
             scheme="pb",
         )
         return furl

src/allmydata/test/test_storage_https.py

@@ -137,7 +137,7 @@ class PinningHTTPSValidation(AsyncTestCase):
         )
 
     @asynccontextmanager
-    async def listen(self, private_key_path, cert_path) -> str:
+    async def listen(self, private_key_path, cert_path):
         """
         Context manager that runs a HTTPS server with the given private key
         and certificate.

tox.ini

@@ -141,6 +141,7 @@ deps =
     types-six
     types-PyYAML
     types-pkg_resources
+    types-pyOpenSSL
     git+https://github.com/warner/foolscap
     # Twisted 21.2.0 introduces some type hints which we are not yet
     # compatible with.