TST: insert 'match' to bare pytest raises in pandas/tests/test_flags.py (#37026)

Co-authored-by: Rajat Bishnoi <rajat.b@greyorange.com>

Author: krajatcl

pandas/tests/test_flags.py

@@ -41,8 +41,8 @@ def test_getitem(self):
         flags["allows_duplicate_labels"] = False
         assert flags["allows_duplicate_labels"] is False
 
-        with pytest.raises(KeyError):
+        with pytest.raises(KeyError, match="a"):
             flags["a"]
 
-        with pytest.raises(ValueError):
+        with pytest.raises(ValueError, match="a"):
             flags["a"] = 10