py38 compat

Author: AlexWaygood

sphinxlint/rst.py

@@ -4,7 +4,7 @@
 - All constants are ALL_CAPS
 - All compiled regexes are suffixed by _RE
 """
-from functools import cache
+from functools import lru_cache
 
 import regex as re
 
@@ -152,7 +152,7 @@
 UNICODE_ALLOWED_AFTER_INLINE_MARKUP = r"\p{Pe}\p{Pi}\p{Pf}\p{Pd}\p{Po}"
 
 
-@cache
+@lru_cache(maxsize=None)
 def inline_markup_gen(start_string, end_string, extra_allowed_before=""):
     """Generate a regex matching an inline markup.