Bump RuboCop to 0.63.0

### Summary

RuboCop 0.63.0 has been released.
https://github.com/rubocop-hq/rubocop/releases/tag/v0.63.0

And rubocop-0-63 channel is available in Code Climate.
https://github.com/codeclimate/codeclimate/releases/tag/v0.83.0

Currently, RuboCop version specified for Gemfile.lock (0.61) and
Code Climate (0.60) are different.

- https://github.com/rails/rails/blob/v6.0.0.beta1/Gemfile.lock#L407
- https://github.com/rails/rails/blob/v6.0.0.beta1/.codeclimate.yml#L26

This PR matches these versions to 0.63.

.codeclimate.yml

@@ -23,7 +23,7 @@ checks:
 engines:
   rubocop:
     enabled: true
-    channel: rubocop-0-60
+    channel: rubocop-0-63
 
 ratings:
   paths:

Gemfile.lock

@@ -283,8 +283,8 @@ GEM
       mini_magick (~> 4.0)
       ruby-vips (>= 2.0.13, < 3)
     io-like (0.3.0)
-    jaro_winkler (1.5.1)
-    jaro_winkler (1.5.1-java)
+    jaro_winkler (1.5.2)
+    jaro_winkler (1.5.2-java)
     jdbc-mysql (5.1.46)
     jdbc-postgres (42.1.4)
     jdbc-sqlite3 (3.20.1)
@@ -345,8 +345,8 @@ GEM
     nokogiri (1.9.1-x86-mingw32)
       mini_portile2 (~> 2.4.0)
     os (1.0.0)
-    parallel (1.12.1)
-    parser (2.5.3.0)
+    parallel (1.13.0)
+    parser (2.6.0.0)
       ast (~> 2.4.0)
     path_expander (1.0.3)
     pg (1.1.3)
@@ -404,7 +404,7 @@ GEM
       resque (~> 1.26)
       rufus-scheduler (~> 3.2)
     retriable (3.1.2)
-    rubocop (0.61.1)
+    rubocop (0.63.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)