fix flake8 requirement in testing

gadfort · gadfort · commit 4a4e2dabab7c · 2025-04-17T07:59:32.000-04:00
diff --git a/requirements.txt b/requirements.txt
@@ -2,4 +2,5 @@
 #:test
 pytest == 8.3.5
 pytest-timeout == 2.3.1
-flake8 == 7.2.0
+flake8 == 7.1.2; python_version <= '3.8'
+flake8 == 7.2.0; python_version >= '3.9'
