chore(deps): Bump flagsmith-flag-engine to ^10.0.4

Picks up the IN segment-condition evaluation speedup
(Flagsmith/flagsmith-engine#295), which cuts per-IN-condition latency
on segment walks by roughly 30%. Complementary to the lazy identity
evaluation added in this PR — most customer envs will benefit from both.

beep boop

Author: khvn26

poetry.lock

@@ -10,7 +10,7 @@ documentation = "https://docs.flagsmith.com"
 packages = [{ include = "flagsmith" }]
 
 [tool.poetry.dependencies]
-flagsmith-flag-engine = "^10.0.3"
+flagsmith-flag-engine = "^10.0.4"
 iso8601 = { version = "^2.1.0", python = "<3.11" }
 python = ">=3.9,<4"
 requests = "^2.32.3"