build: drop py3.7 support

Signed-off-by: Stephen L. <LRQ3000@gmail.com>

Author: lrq3000

pyproject.toml

@@ -31,7 +31,6 @@ classifiers = [
     'Operating System :: POSIX :: Linux',
     'Programming Language :: Python',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',