Test with celery 5.5.0rc3 (getsentry#3842)

Author: sentrivana

tox.ini

@@ -75,7 +75,7 @@ envlist =
     {py3.6,py3.8}-celery-v{4}
     {py3.6,py3.8}-celery-v{5.0}
     {py3.7,py3.10}-celery-v{5.1,5.2}
-    {py3.8,py3.11,py3.12}-celery-v{5.3,5.4}
+    {py3.8,py3.11,py3.12}-celery-v{5.3,5.4,5.5}
     {py3.8,py3.12,py3.13}-celery-latest
 
     # Chalice
@@ -383,6 +383,8 @@ deps =
     celery-v5.2: Celery~=5.2.0
     celery-v5.3: Celery~=5.3.0
     celery-v5.4: Celery~=5.4.0
+    # TODO: update when stable is out
+    celery-v5.5: Celery==5.5.0rc3
     celery-latest: Celery
 
     celery: newrelic