Bump react-rails from 2.6.2 to 3.2.1

Bumps [react-rails](https://github.com/reactjs/react-rails) from 2.6.2 to 3.2.1.
- [Release notes](https://github.com/reactjs/react-rails/releases)
- [Changelog](https://github.com/reactjs/react-rails/blob/master/CHANGELOG.md)
- [Commits](reactjs/react-rails@v2.6.2...v3.2.1)

---
updated-dependencies:
- dependency-name: react-rails
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -141,7 +141,7 @@ GEM
     chartkick (5.1.2)
     coderay (1.1.3)
     concurrent-ruby (1.3.4)
-    connection_pool (2.3.0)
+    connection_pool (2.4.1)
     countries (7.0.0)
       unaccent (~> 0.3)
     country_select (10.0.0)
@@ -287,7 +287,7 @@ GEM
     mini_magick (4.13.2)
     mini_mime (1.1.2)
     mini_portile2 (2.8.8)
-    minitest (5.25.2)
+    minitest (5.25.4)
     msgpack (1.6.0)
     multi_json (1.15.0)
     multi_xml (0.6.0)
@@ -408,7 +408,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    react-rails (2.6.2)
+    react-rails (3.2.1)
       babel-transpiler (>= 0.7.0)
       connection_pool
       execjs
@@ -502,7 +502,7 @@ GEM
       sprockets (>= 3.0.0)
     temple (0.10.0)
     thor (1.3.2)
-    tilt (2.0.11)
+    tilt (2.4.0)
     timecop (0.9.6)
     timeout (0.3.1)
     tinymce-rails (6.3.1)