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](https://github.com/reactjs/react-rails/compare/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] <support@github.com>

Gemfile.lock

@@ -1294,7 +1294,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.3.3)
-    connection_pool (2.4.0)
+    connection_pool (2.4.1)
     crass (1.0.6)
     csv (3.2.6)
     d3-rails (5.9.2)
@@ -1333,7 +1333,7 @@ GEM
     erubi (1.13.0)
     event_emitter (0.2.6)
     eventmachine (1.2.7)
-    execjs (2.8.1)
+    execjs (2.9.1)
     faraday (1.10.3)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
@@ -1457,7 +1457,7 @@ GEM
       rake
     mini_magick (4.11.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.2)
+    mini_portile2 (2.8.7)
     mini_racer (0.6.3)
       libv8-node (~> 16.10.0.0)
     minitest (5.24.0)
@@ -1564,7 +1564,7 @@ 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
@@ -1647,7 +1647,7 @@ GEM
     textstat (0.1.8)
       text-hyphen (~> 1.4, >= 1.4.1)
     thor (1.3.1)
-    tilt (2.0.11)
+    tilt (2.3.0)
     timeago_js (3.0.2.2)
     timeout (0.3.2)
     tribute (3.6.0.0)