Turn off flake8-simplify for Python≥3.14 (#7058)

* Turn off flake8-simplify for Python≥3.14
According to flake8-simplify is isn't supported
for Python≥3.9, but it works until 3.13.
* flake8: ignore new rule B042
   See #7059

---------

Co-authored-by: Oliver Sanders <[email protected]>

Author: oliver-sanders

setup.cfg

@@ -104,7 +104,7 @@ tests =
     flake8-debugger>=4.0.0
     flake8-implicit-str-concat>=0.4
     flake8-mutable>=1.2.0
-    flake8-simplify>=0.14.0
+    flake8-simplify>=0.14.0; python_version<"3.14"
     flake8-type-checking
     flake8>=3.0.0
     mypy>=0.910

tox.ini

@@ -16,6 +16,9 @@ ignore=
     SIM9
     ; explicitly concatenated strings (flake8-implicit-str-concat)
     ISC003
+    ; not all exception subclass __init__ args passed to super __init__
+    ; see https://github.com/cylc/cylc-flow/issues/7059
+    B042
 
 per-file-ignores=
     ; TYPE_CHECKING block suggestions