tests: improve concatenation of Python lists

tests/unit/scripts/python/testapigen.py

@@ -226,7 +226,7 @@ class WeechatRubyScript(WeechatScript):
             if isinstance(node, ast.Call) \
                     and isinstance(node.func, ast.Attribute) \
                     and node.func.attr == 'config_new_option':
-                node.args = node.args[:11] + [ast.List(node.args[11:])]
+                node.args = [*node.args[:11], ast.List(node.args[11:])]
 
 
 class WeechatLuaScript(WeechatScript):

tests/unit/scripts/python/unparse.py

@@ -1385,7 +1385,7 @@ LANGUAGES = get_languages()
 
 def get_parser():
     """Get parser arguments."""
-    all_languages = LANGUAGES + ['all']
+    all_languages = [*LANGUAGES, 'all']
     default_language = LANGUAGES[0]
     parser = argparse.ArgumentParser(
         description=('Unparse Python code from stdin and generate code in '