[pyupgrade] `synapse/` (#10348)

This PR is tantamount to running 
```
pyupgrade --py36-plus --keep-percent-format `find synapse/ -type f -name "*.py"`
```

Part of #9744

2 files changed, 2 insertions, 2 deletions

diff --git a/synapse/http/proxyagent.py b/synapse/http/proxyagent.py

index 7a6a1717de..f7193e60bd 100644
--- a/synapse/http/proxyagent.py
+++ b/synapse/http/proxyagent.py
@@ -172,7 +172,7 @@ class ProxyAgent(_AgentBase):
         """
         uri = uri.strip()
         if not _VALID_URI.match(uri):
-            raise ValueError("Invalid URI {!r}".format(uri))
+            raise ValueError(f"Invalid URI {uri!r}")
 
         parsed_uri = URI.fromBytes(uri)
         pool_key = (parsed_uri.scheme, parsed_uri.host, parsed_uri.port)
diff --git a/synapse/http/site.py b/synapse/http/site.py

index 3b0a38124e..190084e8aa 100644
--- a/synapse/http/site.py
+++ b/synapse/http/site.py
@@ -384,7 +384,7 @@ class SynapseRequest(Request):
         # authenticated (e.g. and admin is puppetting a user) then we log both.
         requester, authenticated_entity = self.get_authenticated_entity()
         if authenticated_entity:
-            requester = "{}.{}".format(authenticated_entity, requester)
+            requester = f"{authenticated_entity}.{requester}"
 
         self.site.access_logger.log(
             log_level,