Revert "generate-bpf-delegate-configs: fix compatibility with Python 3.7"

This reverts commit dee77ac201.

Now we require Python 3.9 or newer.

src/core/generate-bpf-delegate-configs.py

@@ -7,7 +7,6 @@
 
 import re
 import sys
-import typing
 
 
 def print_usage_and_exit() -> None:
@@ -27,7 +26,7 @@ if output not in ['code', 'doc']:
 
 with open(header) as file:
     inEnum = False
-    enumValues: typing.List[str] = []
+    enumValues: list[str] = []
     enumName = ''
 
     if output == 'doc':
@@ -68,12 +67,10 @@ with open(header) as file:
                 match = re.fullmatch(r'(\w+)\b,', line)
                 if match and len(match.groups()) > 0 and not match[1].startswith('__'):
                     enumValues.append(match[1])
-        else:
-            match = re.match(r'^\s*enum\s+bpf_(cmd|map_type|prog_type|attach_type)+\s*{', line)
-            if match:
-                # Start of a new enum
-                inEnum = True
-                enumName = 'bpf_delegate_' + match[1]
+        elif match := re.match(r'^\s*enum\s+bpf_(cmd|map_type|prog_type|attach_type)+\s*{', line):
+            # Start of a new enum
+            inEnum = True
+            enumName = 'bpf_delegate_' + match[1]
 
     if output == 'doc':
         print('</para>')