1) Ensure that eventlet's subprocess is used for Python versions up to 3.11 and await the issue resolution for Python versions 3.12.

2) Fixed unescape sequence for Python 3.12

tools/sql_keywords.py

@@ -21,7 +21,7 @@ PG_CODES_URLS = [
     "https://raw.githubusercontent.com/postgres/postgres/master/src/pl/"
     "plpgsql/src/pl_scanner.c",
 ]
-PG_CODES_REGEX = "PG_KEYWORD\(\"([a-z]*)\"[A-Z_, ]*\)"
+PG_CODES_REGEX = r"PG_KEYWORD\(\"([a-z]*)\"[A-Z_, ]*\)"
 
 PG_SQL_DOCS_URL = \
     "https://www.postgresql.org/docs/current/sql-keywords-appendix.html"