Merge pull request freqtrade#11980 from freqtrade/dependabot/pip/develop/python-rapidjson-1.21

chore(deps): bump python-rapidjson from 1.20 to 1.21

Author: xmatthias

ft_client/requirements.txt

@@ -1,3 +1,3 @@
 # Requirements for freqtrade client library
 requests==2.32.4
-python-rapidjson==1.20
+python-rapidjson==1.21

requirements.txt

@@ -28,7 +28,7 @@ rich==14.0.0
 pyarrow==20.0.0; platform_machine != 'armv7l'
 
 # Load ticker files 30% faster
-python-rapidjson==1.20
+python-rapidjson==1.21
 # Properly format api responses
 orjson==3.10.18