Bump rubocop from 1.37.1 to 1.40.0

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.37.1 to 1.40.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.37.1...v1.40.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -139,7 +139,7 @@ GEM
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
-    json (2.6.2)
+    json (2.6.3)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
@@ -175,7 +175,7 @@ GEM
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.1)
-    parser (3.1.2.1)
+    parser (3.1.3.0)
       ast (~> 2.4.1)
     pg (1.4.4)
     puma (6.0.0)
@@ -227,7 +227,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     ref (2.0.0)
-    regexp_parser (2.6.0)
+    regexp_parser (2.6.1)
     reverse_markdown (2.1.1)
       nokogiri
     rexml (3.2.5)
@@ -235,7 +235,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
-    rubocop (1.37.1)
+    rubocop (1.40.0)
       json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.1.2.1)
@@ -245,7 +245,7 @@ GEM
       rubocop-ast (>= 1.23.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.23.0)
+    rubocop-ast (1.24.0)
       parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
     safe_yaml (1.0.5)
@@ -358,7 +358,7 @@ DEPENDENCIES
   rails-dom-testing (~> 2.0.0)
   rails_autolink
   rspec-expectations
-  rubocop (~> 1.37)
+  rubocop (~> 1.40)
   sanitize (~> 6.0)
   sassc-rails (~> 2.1.2)
   simplecov