Drop support for 3.8 from readme badge, update copyright year

Author: rlaphoenix

README.md

@@ -9,7 +9,7 @@
         <img src="https://github.com/devine-dl/pywidevine/actions/workflows/ci.yml/badge.svg" alt="Build status">
     </a>
     <a href="https://pypi.org/project/pywidevine">
-        <img src="https://img.shields.io/badge/python-3.8%2B-informational" alt="Python version">
+        <img src="https://img.shields.io/badge/python-3.9%2B-informational" alt="Python version">
     </a>
     <a href="https://deepsource.io/gh/devine-dl/pywidevine">
         <img src="https://deepsource.io/gh/devine-dl/pywidevine.svg/?label=active+issues" alt="DeepSource">
@@ -163,4 +163,4 @@ You can find a copy of the license in the LICENSE file in the root folder.
 
 * * *
 
-© rlaphoenix 2022-2023
+© rlaphoenix 2022-2025