chore(deps): update flagsmith-flag-engine (#133)

Author: matthewelwell

poetry.lock

@@ -13,7 +13,7 @@ packages = [{ include = "flagsmith" }]
 python = ">=3.8.1,<4"
 requests = "^2.32.3"
 requests-futures = "^1.0.1"
-flagsmith-flag-engine = "^5.1.0"
+flagsmith-flag-engine = "^5.3.1"
 sseclient-py = "^1.8.0"
 pydantic = "^2"