Enable rubocop check for the file since #52610 it is no longer automatically generated file.

```
Offenses:

actionpack/lib/action_dispatch/journey/parser.rb:1:1: C: [Corrected] Style/FrozenStringLiteralComment: Missing frozen string literal comment.
actionpack/lib/action_dispatch/journey/parser.rb:25:7: C: [Corrected] Layout/EmptyLinesAroundAccessModifier: Remove a blank line after private.
      private
      ^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:27:7: C: [Corrected] Layout/IndentationWidth: Use 2 (not 0) spaces for indented_internal_methods indentation.
      def advance_token

actionpack/lib/action_dispatch/journey/parser.rb:31:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def do_parse ...
      ^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:35:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_expressions ...
      ^^^^^^^^^^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:52:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_or(lhs) ...
      ^^^^^^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:58:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_expression ...
      ^^^^^^^^^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:68:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_star ...
      ^^^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:74:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_group ...
      ^^^^^^^^^^^^^^^
actionpack/lib/action_dispatch/journey/parser.rb:86:7: C: [Corrected] Layout/IndentationConsistency: Inconsistent indentation detected.
      def parse_terminal ...
      ^^^^^^^^^^^^^^^^^^
```