[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

mypy/stubtest.py

@@ -1326,7 +1326,7 @@ def verify_var(
     elif stub.final_value is not None and stub.final_value != runtime:
         yield Error(
             object_path,
-            f"is inconsistent, stub value for Final var differs from runtime value",
+            "is inconsistent, stub value for Final var differs from runtime value",
             stub,
             runtime,
             stub_desc=repr(stub.final_value),