Update version of Black to 22.3.0

Update version of Black to 22.3.0 due to updated dependencies.
Updates to fix reported issues due to new version.

Signed-off-by: Jonas Ohlsson <jonas.ohlsson@arm.com>
Change-Id: I60056aae452093ce8dcea1f499ecced22b25eef1
diff --git a/ethosu/mlw_codec/test/test_mlw_codec.py b/ethosu/mlw_codec/test/test_mlw_codec.py
index 3ff26e5..d77c82a 100644
--- a/ethosu/mlw_codec/test/test_mlw_codec.py
+++ b/ethosu/mlw_codec/test/test_mlw_codec.py
@@ -24,7 +24,7 @@
 
 
 class TestMLWCodec:
-    """ This class is responsible to test the mlw_codec library
+    """This class is responsible to test the mlw_codec library
     It mainly tests the two methods encode() and decode() with different inputs"""
 
     weights = [0, 2, 3, 0, -1, -2, -3, 0, 0, 0, 1, -250, 240] * 3