Merge branch 'complexity/descrease-abc-size-threshold' into 'master'

Decrease threshold for ABC Size metric in Rubocop

To 55.

References #3444

See merge request !3598

.rubocop.yml

@@ -691,7 +691,7 @@ Style/ZeroLengthPredicate:
 # branches, and conditions.
 Metrics/AbcSize:
   Enabled: true
-  Max: 70
+  Max: 60
 
 # Avoid excessive block nesting.
 Metrics/BlockNesting: