Python: support 3.13; drop 3.8/3.9

Python 3.8/3.9 are both end-of-life, and we drop them.

Author: bastonero

.github/workflows/cd.yml

@@ -58,7 +58,7 @@ jobs:
 
         strategy:
             matrix:
-                python-version: ['3.10','3.12']
+                python-version: ['3.10','3.12','3.13']
 
         services:
             postgres:

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
 
         strategy:
             matrix:
-                python-version: ['3.10','3.12']
+                python-version: ['3.10','3.12','3.13']
 
         services:
             rabbitmq:

pyproject.toml

@@ -17,14 +17,13 @@ classifiers = [
     'Operating System :: POSIX :: Linux',
     'Operating System :: MacOS :: MacOS X',
     'Programming Language :: Python',
-    'Programming Language :: Python :: 3.8',
-    'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
     'Programming Language :: Python :: 3.12',
+    'Programming Language :: Python :: 3.13',
 ]
 keywords = ['aiida', 'workflows']
-requires-python = '>=3.8'
+requires-python = '>=3.10'
 dependencies = [
     "aiida-core~=2.3",
     "aiida-quantumespresso~=4.10",