Upgrade: Bump rubocop-ast from 1.0.1 to 1.8.0

Bumps [rubocop-ast](https://github.com/rubocop-hq/rubocop-ast) from 1.0.1 to 1.8.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-ast/compare/v1.0.1...v1.8.0)

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

Gemfile.lock

@@ -66,7 +66,7 @@ GEM
       rake (>= 10.4, < 14.0)
     ansi (1.5.0)
     arel (6.0.4)
-    ast (2.4.1)
+    ast (2.4.2)
     attachinary (1.3.1)
       cloudinary (~> 1.1.0)
       rails (>= 3.2)
@@ -427,7 +427,7 @@ GEM
       activesupport (>= 3.0, < 6.0)
       request_store (~> 1.1)
     parallel (1.19.2)
-    parser (2.7.2.0)
+    parser (3.0.2.0)
       ast (~> 2.4.1)
     pg (0.20.0)
     pg_search (2.3.0)
@@ -527,8 +527,8 @@ GEM
       rubocop-ast (>= 0.0.3)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (1.0.1)
-      parser (>= 2.7.1.5)
+    rubocop-ast (1.8.0)
+      parser (>= 3.0.1.1)
     ruby-progressbar (1.10.1)
     ruby2_keywords (0.0.2)
     rubyzip (1.3.0)