Sort exported symbols

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/channels/util/__init__.py

@@ -57,13 +57,13 @@
     "Merge",
     "MergeNamed",
     "MissedTickPolicy",
-    "Timer",
     "SelectError",
     "SelectErrorGroup",
     "Selected",
     "Selector",
     "SkipMissedAndDrift",
     "SkipMissedAndResync",
+    "Timer",
     "TriggerAllMissed",
     "UnhandledSelectedError",
     "select",