fix(security): Pin tornado>=6.5.5 (GHSA-qjxf-f2mg-c6mc) (#5425)

# What does this PR do?
Addresses  DoS due to too many multipart parts

Refs:
[GHSA-qjxf-f2mg-c6mc](GHSA-qjxf-f2mg-c6mc)

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>
(cherry picked from commit 0614673)

Author: nathan-weinberg

pyproject.toml

@@ -54,7 +54,7 @@ dependencies = [
     "sqlalchemy[asyncio]>=2.0.41",                    # server - for conversations
     "starlette>=0.49.1",
     "psycopg2-binary",
-    "tornado>=6.5.3",
+    "tornado>=6.5.5",
     "urllib3>=2.6.3",
     "oracledb>=3.4.1",
     "oci>=2.165.0",