Remove usage of deprecated logger.warn method from codebase (#6271)

Replace every instance of `logger.warn` with `logger.warning` as the former is deprecated.

1 files changed, 1 insertions, 1 deletions

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

index 46af27c8f6..58f9cc61c8 100644
--- a/synapse/http/request_metrics.py
+++ b/synapse/http/request_metrics.py
@@ -170,7 +170,7 @@ class RequestMetrics(object):
             tag = context.tag
 
             if context != self.start_context:
-                logger.warn(
+                logger.warning(
                     "Context have unexpectedly changed %r, %r",
                     context,
                     self.start_context,