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

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

Author: pre-commit-ci[bot]

mypyc/test-data/irbuild-str.test

@@ -665,4 +665,4 @@ L0:
     r1 = 'True3.14123abc'
     r2 = 'abc1233.14True'
     r3 = CPyStr_Build(7, x, r0, x, r1, x, r2, x)
-    return r3
+    return r3

mypyc/test-data/run-strings.test

@@ -1025,4 +1025,4 @@ class subc(str):
 
 [file userdefinedstr.py]
 class str:
-    pass
+    pass