Update dependency pyflakes to v3.4.0

Author: elastic-renovate-prod[bot]

pyproject.toml

@@ -48,7 +48,7 @@ dependencies = [
 dev = [
   "pep8-naming==0.13.0",
   "flake8==7.0.0",
-  "pyflakes==3.2.0",
+  "pyflakes==3.4.0",
   "pytest>=8.1.1",
   "nodeenv==1.8.0",
   "pre-commit==3.6.2",