Turn off linter message

For technical reasons, pylint can't treat adafruit_itertools as a package
when analyzing it, leading to the reported diagnostic

************* Module adafruit_itertools_extras
E: 79, 0: Attempted relative import beyond top-level package (relative-beyond-top-level)

Since creating an empty __init__.py would consume 512 valuable bytes of
storage on a circuitpython device, instead just silence the message.

Author: jepler

adafruit_itertools/adafruit_itertools_extras.py

@@ -74,7 +74,7 @@
   https://github.com/adafruit/circuitpython/releases
 """
 
-#pylint:disable=invalid-name,deprecated-lambda,keyword-arg-before-vararg
+#pylint:disable=invalid-name,deprecated-lambda,keyword-arg-before-vararg,relative-beyond-top-level
 
 from . import adafruit_itertools as it