[core] fix typo in flake8 version spec

Author: MrClock8163

pyproject.toml

@@ -65,7 +65,7 @@ linting = [
     "types-toml>=0.10.8.20240310",
     "types-PyYAML>=6.0.12.20250516",
     "mypy>=1.17.1",
-    "flake>=7.3.0"
+    "flake8>=7.3.0"
 ]
 development = [
     {include-group = "linting"}