Update black, and run auto formatting over the codebase (#9381)

 - Update black version to the latest
 - Run black auto formatting over the codebase
    - Run autoformatting according to [`docs/code_style.md
`](https://github.com/matrix-org/synapse/blob/80d6dc9783aa80886a133756028984dbf8920168/docs/code_style.md)
 - Update `code_style.md` docs around installing black to use the correct version

1 files changed, 4 insertions, 2 deletions

diff --git a/synapse/handlers/saml_handler.py b/synapse/handlers/saml_handler.py
index 78f130e152..a9645b77d8 100644
--- a/synapse/handlers/saml_handler.py
+++ b/synapse/handlers/saml_handler.py
@@ -121,7 +121,8 @@ class SamlHandler(BaseHandler):
 
         now = self.clock.time_msec()
         self._outstanding_requests_dict[reqid] = Saml2SessionData(
-            creation_time=now, ui_auth_session_id=ui_auth_session_id,
+            creation_time=now,
+            ui_auth_session_id=ui_auth_session_id,
         )
 
         for key, value in info["headers"]:
@@ -450,7 +451,8 @@ class DefaultSamlMappingProvider:
             mxid_source = saml_response.ava[self._mxid_source_attribute][0]
         except KeyError:
             logger.warning(
-                "SAML2 response lacks a '%s' attestation", self._mxid_source_attribute,
+                "SAML2 response lacks a '%s' attestation",
+                self._mxid_source_attribute,
             )
             raise SynapseError(
                 400, "%s not in SAML2 response" % (self._mxid_source_attribute,)