Bump rubocop-ast from 1.4.1 to 1.5.0

Bumps [rubocop-ast](https://github.com/rubocop-hq/rubocop-ast) from 1.4.1 to 1.5.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-ast@v1.4.1...v1.5.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -33,7 +33,7 @@ GEM
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.7)
     parallel (1.20.1)
-    parser (3.0.1.0)
+    parser (3.0.1.1)
       ast (~> 2.4.1)
     power_assert (2.0.0)
     puma (4.3.7)
@@ -63,8 +63,8 @@ GEM
       rubocop-ast (>= 1.2.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.4.1)
-      parser (>= 2.7.1.5)
+    rubocop-ast (1.5.0)
+      parser (>= 3.0.1.1)
     rubocop-performance (1.11.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)