Enable ruff rule Perflint (PERF)

See: https://docs.astral.sh/ruff/rules/#perflint-perf

Fix the following new warnings:
lieer/gmailieer.py:866:17: PERF401 Use a list comprehension to create a transformed list

.ruff.toml

@@ -34,7 +34,7 @@ target-version = "py39"
 # Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.
 # Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
 # McCabe complexity (`C901`) by default.
-select = ["E4", "E7", "E9", "F", "I", "UP", "C4", "SIM"]
+select = ["E4", "E7", "E9", "F", "I", "UP", "C4", "SIM", "PERF"]
 ignore = [
     "E501",  # Line too long
     "E741",  # Ambiguous variable name: `l`

lieer/gmailieer.py

@@ -862,8 +862,7 @@ def full_pull(self):
             self.bar.total = total
             self.bar_update(len(gids))
 
-            for m in gids:
-                message_gids.append(m["id"])
+            message_gids = [m["id"] for m in gids]
 
             if self.limit is not None and len(message_gids) >= self.limit:
                 break