Update locked frozendict version to 2.3.3 (#13352)

frozendict 2.3.3 includes fixes for memory leaks that get triggered during `/sync`.

changelog.d/13352.bugfix

@@ -0,0 +1 @@
+Update locked version of `frozendict` to 2.3.3, which has fixes for memory leaks affecting `/sync`.

docs/upgrade.md

@@ -114,6 +114,15 @@ vice versa.
 Once all workers are upgraded to v1.64 (or downgraded to v1.63), event
 replication will resume as normal.
 
+## frozendict release
+
+[frozendict 2.3.3](https://github.com/Marco-Sulla/python-frozendict/releases/tag/v2.3.3)
+has recently been released, which fixes a memory leak that occurs during `/sync`
+requests. We advise server administrators who installed Synapse via pip to upgrade
+frozendict with `pip install --upgrade frozendict`. The Docker image
+`matrixdotorg/synapse` and the Debian packages from `packages.matrix.org` already
+include the updated library.
+
 # Upgrading to v1.62.0
 
 ## New signatures for spam checker callbacks

poetry.lock

@@ -290,7 +290,7 @@ importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "frozendict"
-version = "2.3.2"
+version = "2.3.3"
 description = "A simple immutable dictionary"
 category = "main"
 optional = false
@@ -1753,23 +1753,23 @@ flake8-comprehensions = [
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 ]
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