Merge PR #4667 from @MrSeccubus - Fix error in extension check in sigma-logsource-checker.py

chore: add additional checks to the `sigma-logsource-checker.py` so that it only cares about yaml files
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Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>

documentation/tools/sigma-logsource-checker.py

@@ -111,7 +111,8 @@ WINDOWS_SECURITY_SPECIAL_PROCESS_CREATION_FIELDS = ["SubjectUserSid", "SubjectUs
 def yield_next_rule_file_path(path_to_rules: str) -> str:
     for root, _, files in os.walk(path_to_rules):
         for file in files:
-            yield os.path.join(root, file)
+            if file.endswith(".yml"):
+                yield os.path.join(root, file)
 
 def get_rule_part(file_path: str, part_name: str):
     yaml_dicts = get_rule_yaml(file_path)