Bump better_errors from 2.8.1 to 2.8.3 (#14927)

Bumps [better_errors](https://github.com/BetterErrors/better_errors) from 2.8.1 to 2.8.3.
- [Release notes](https://github.com/BetterErrors/better_errors/releases)
- [Commits](https://github.com/BetterErrors/better_errors/compare/v2.8.1...v2.8.3)

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Gemfile.lock

@@ -95,7 +95,7 @@ GEM
     aws-sigv4 (1.2.2)
       aws-eventstream (~> 1, >= 1.0.2)
     bcrypt (3.1.16)
-    better_errors (2.8.1)
+    better_errors (2.8.3)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)