Use immutabledict instead of frozendict (#15113)

Additionally:

* Consistently use `freeze()` in test

---------

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/synapse/util/frozenutils.py b/synapse/util/frozenutils.py

index 7223af1a36..889caa2601 100644
--- a/synapse/util/frozenutils.py
+++ b/synapse/util/frozenutils.py
@@ -14,14 +14,14 @@
 import collections.abc
 from typing import Any
 
-from frozendict import frozendict
+from immutabledict import immutabledict
 
 
 def freeze(o: Any) -> Any:
     if isinstance(o, dict):
-        return frozendict({k: freeze(v) for k, v in o.items()})
+        return immutabledict({k: freeze(v) for k, v in o.items()})
 
-    if isinstance(o, frozendict):
+    if isinstance(o, immutabledict):
         return o
 
     if isinstance(o, (bytes, str)):