Update dependency flake8 to v7.3.0

Author: elastic-renovate-prod[bot]

pyproject.toml

@@ -47,7 +47,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
   "pep8-naming==0.13.0",
-  "flake8==7.0.0",
+  "flake8==7.3.0",
   "pyflakes==3.2.0",
   "pytest>=8.1.1",
   "nodeenv==1.8.0",