libtmux(fix[logging]): remove stack_info from query_list DEBUG logs

why: stack_info=True dumps a full stack trace on routine lookup misses,
which is noisy and unnecessary — exc_info=True already captures the
exception context.
what:
- Remove stack_info=True from keygetter DEBUG log
- Remove stack_info=True from parse_lookup DEBUG log

Author: tony

src/libtmux/_internal/query_list.py

@@ -109,7 +109,6 @@ def keygetter(
             "key lookup failed for path: %s",
             path,
             exc_info=True,
-            stack_info=True,
         )
         return None
 
@@ -154,7 +153,6 @@ def parse_lookup(
             "lookup parsing failed for path: %s",
             path,
             exc_info=True,
-            stack_info=True,
         )
     return None