Fix remaining 3.9 reminders.

Author: icemac

README.rst

@@ -28,7 +28,7 @@ Requirements
 
 You will need the following prerequisites in order to use pytest-rerunfailures:
 
-- Python 3.9+ or PyPy3
+- Python 3.10+ or PyPy3
 - pytest 8.0 or newer
 
 This plugin can recover from a hard crash with the following optional

pyproject.toml

@@ -22,7 +22,7 @@ keywords = [
 ]
 license.text = "MPL-2.0"
 authors = [{name = "Leah Klearman", email = "[email protected]"}]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
   "Development Status :: 5 - Production/Stable",
   "Framework :: Pytest",
@@ -31,7 +31,6 @@ classifiers = [
   "Operating System :: Microsoft :: Windows",
   "Operating System :: POSIX",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",