Build(deps-dev): Bump rubocop-ast from 1.16.0 to 1.31.2

Bumps [rubocop-ast](https://github.com/rubocop/rubocop-ast) from 1.16.0 to 1.31.2.
- [Release notes](https://github.com/rubocop/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-ast@v1.16.0...v1.31.2)

---
updated-dependencies:
- dependency-name: rubocop-ast
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -106,6 +106,7 @@ GEM
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
     diffy (3.4.0)
+    digest (3.0.0)
     discourse-ember-rails (0.18.6)
       active_model_serializers
       ember-data-source (>= 1.0.0.beta.5)
@@ -201,11 +202,6 @@ GEM
       uri_template (~> 0.7)
     jwt (2.3.0)
     kgio (2.11.4)
-    libv8-node (16.10.0.0)
-    libv8-node (16.10.0.0-aarch64-linux)
-    libv8-node (16.10.0.0-arm64-darwin)
-    libv8-node (16.10.0.0-x86_64-darwin)
-    libv8-node (16.10.0.0-x86_64-darwin-19)
     libv8-node (16.10.0.0-x86_64-linux)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -231,7 +227,6 @@ GEM
       rack (>= 1.1.3)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.0)
     mini_racer (0.6.2)
       libv8-node (~> 16.10.0.0)
     mini_scheduler (0.13.0)
@@ -246,16 +241,19 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     mustache (1.1.1)
+    net-imap (0.2.4)
+      digest
+      net-protocol
+      strscan
+    net-pop (0.1.2)
+      net-protocol
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.2.2)
+      digest
+      net-protocol
+      timeout
     nio4r (2.5.8)
-    nokogiri (1.13.3)
-      mini_portile2 (~> 2.8.0)
-      racc (~> 1.4)
-    nokogiri (1.13.3-aarch64-linux)
-      racc (~> 1.4)
-    nokogiri (1.13.3-arm64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.13.3-x86_64-darwin)
-      racc (~> 1.4)
     nokogiri (1.13.3-x86_64-linux)
       racc (~> 1.4)
     oauth (0.5.8)
@@ -296,8 +294,9 @@ GEM
     parallel (1.22.1)
     parallel_tests (3.7.3)
       parallel
-    parser (3.1.1.0)
+    parser (3.3.0.5)
       ast (~> 2.4.1)
+      racc
     pg (1.3.4)
     progress (3.6.0)
     pry (0.13.1)
@@ -402,8 +401,8 @@ GEM
       rubocop-ast (>= 1.16.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.16.0)
-      parser (>= 3.1.1.0)
+    rubocop-ast (1.31.2)
+      parser (>= 3.3.0.4)
     rubocop-discourse (2.5.0)
       rubocop (>= 1.1.0)
       rubocop-rspec (>= 2.0.0)
@@ -452,9 +451,11 @@ GEM
       sprockets (>= 3.0.0)
     sshkey (2.0.0)
     stackprof (0.2.19)
+    strscan (3.1.0)
     test-prof (1.0.7)
     thor (1.2.1)
     tilt (2.0.10)
+    timeout (0.4.1)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
@@ -480,12 +481,6 @@ GEM
     zeitwerk (2.5.4)
 
 PLATFORMS
-  aarch64-linux
-  arm64-darwin-20
-  ruby
-  x86_64-darwin-18
-  x86_64-darwin-19
-  x86_64-darwin-20
   x86_64-linux
 
 DEPENDENCIES
@@ -514,6 +509,7 @@ DEPENDENCIES
   cppjieba_rb
   css_parser
   diffy
+  digest (= 3.0.0)
   discourse-ember-rails (= 0.18.6)
   discourse-ember-source (~> 3.12.2)
   discourse-fonts
@@ -556,6 +552,9 @@ DEPENDENCIES
   mocha
   multi_json
   mustache
+  net-imap (~> 0.2.1)
+  net-pop (~> 0.1.1)
+  net-smtp (~> 0.2.1)
   nokogiri
   oj
   omniauth