Require python-gmp>=0.4.0b2

Author: skirpichev

pyproject.toml

@@ -37,7 +37,7 @@ develop = ['mpmath[tests]', 'flake518>=1.5; python_version>="3.9"',
            'pytest-cov', 'wheel', 'build']
 gmpy2 = ['gmpy2>=2.2; platform_python_implementation!="PyPy"']
 gmpy = ['mpmath[gmpy2]']
-gmp = ['python-gmp>=0.4.0a1; platform_python_implementation!="PyPy"']
+gmp = ['python-gmp>=0.4.0b2; platform_python_implementation!="PyPy"']
 docs = ['sphinx',
         'matplotlib; platform_python_implementation!="PyPy" and python_version<"3.14"',
         'sphinxcontrib-autoprogram']