⬆️(backend) upgrade celery to 5.6.3

Upgrade celery this latest release
have a memory leak fix in its
changelog and we want to handle
this issue.

Author: liamls

CHANGELOG.md

@@ -12,6 +12,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 - Update Volta configuration with yarn fixed version
 - Update docker-compose for new versions
+- Upgrade Celery version from 5.5.2 to 5.6.3
 
 ## [5.12.2] - 2026-01-22
 

src/backend/setup.cfg

@@ -29,7 +29,7 @@ requires-python = >=3.9
 install_requires =
     Brotli==1.1.0
     boto3==1.38.5
-    celery==5.5.2
+    celery==5.6.3
     channels-redis==4.2.1
     channels[daphne]==4.2.2
     chardet==5.2.0