Require astunparse for older python versions

Author: Matej Spiller Muys

python/requirements.in

@@ -4,4 +4,4 @@
 validate-email>=1.3
 Jinja2>=2.11.1
 protobuf>=5.27.0
-astunparse>=1.6.3
+astunparse>=1.6.3 ; python_version < '3.10'

python/setup.cfg

@@ -14,14 +14,19 @@ classifiers =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     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
 
 [options]
 packages = find:
 install_requires =
     validate-email>=1.3
     Jinja2>=2.11.1
     protobuf>=5.27.0
-    astunparse>=1.6.3
+    astunparse>=1.6.3 ; python_version < '3.10'
 python_requires = >=3.6
 
 [options.data_files]