add v1.33 to backports (#2130)

Author: jwilliams-mongo

.backportrc.json

@@ -2,7 +2,7 @@
     "repoOwner": "10gen",
     "repoName": "docs-k8s-operator",
 
-    "targetBranchChoices": ["v1.32", "v1.31", "v1.30", "v1.29", "v1.28", "v1.27", "v1.26", "v1.25"],
+    "targetBranchChoices": ["v1.33", "v1.32", "v1.31", "v1.30", "v1.29", "v1.28", "v1.27", "v1.26", "v1.25"],
 
     "editor": "code",