Use Lint/MissingSuper instead of Style/MethodMissingSuper

This commit fixes the following error:

> Error: The `Style/MethodMissingSuper` cop has been removed since
> it has been superseded by `Lint/MissingSuper`. Please use
> `Lint/MissingSuper` instead.

cf. rubocop/rubocop#8376

.rubocop.yml

@@ -30,8 +30,6 @@ Style/Documentation:
   Enabled: false
 Style/GuardClause:
   Enabled: false
-Style/MethodMissingSuper:
-  Enabled: false
 Style/MixinUsage:
   Exclude:
     - 'spec/**/*'
@@ -47,6 +45,8 @@ Layout/SpaceAroundMethodCallOperator:
   Enabled: true
 Lint/DeprecatedOpenSSLConstant:
   Enabled: true
+Lint/MissingSuper:
+  Enabled: false
 Lint/MixedRegexpCaptureTypes:
   Enabled: true
 Lint/RaiseException: