Fix requirement

Author: honnibal

requirements.txt

@@ -6,7 +6,7 @@ pathy>=0.3.5
 pytest>=5.2.0,!=7.1.0
 mypy>=1.7.0,<1.8.0; platform_machine != 'aarch64'
 numpy>=1.15.0
-black>=25,<26
+black
 flake8>=7,<8
 isort>=7,<8
 hypothesis