Update Python version requirement to 3.9

Signed-off-by: jboursier-mwb <jboursier@malwarebytes.com>

Author: jboursier-mwb

pyproject.toml

@@ -6,7 +6,7 @@ authors = [{name="jboursier", email="jboursier@malwarebytes.com"}]
 license = "MIT"
 readme = "README.md"
 keywords = ["security", "cli", "github", "utility"]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",