Fixes effect error in pure/logging.nim (#11898)

* Fix effect error in pure/logging.nim

Currently calling `logging.log` will produce - `Error: can have an unlisted effect: RootEffect`. Add `RootEffect` to list of tags.

* the only tag necessary is RootEffect since all other Effects are descendants of RootEffect

lib/pure/logging.nim

@@ -320,7 +320,7 @@ proc substituteLog*(frmt: string, level: Level, args: varargs[string, `$`]): str
 
 method log*(logger: Logger, level: Level, args: varargs[string, `$`]) {.
             raises: [Exception], gcsafe,
-            tags: [TimeEffect, WriteIOEffect, ReadIOEffect], base.} =
+            tags: [RootEffect], base.} =
   ## Override this method in custom loggers. The default implementation does
   ## nothing.
   ##