Bump better_errors from 2.9.0 to 2.9.1

Bumps [better_errors](https://github.com/BetterErrors/better_errors) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/BetterErrors/better_errors/releases)
- [Commits](BetterErrors/better_errors@v2.9.0...v2.9.1)

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

Gemfile.lock

@@ -89,7 +89,7 @@ GEM
       aws-sigv4 (~> 1.1)
     aws-sigv4 (1.2.2)
       aws-eventstream (~> 1, >= 1.0.2)
-    better_errors (2.9.0)
+    better_errors (2.9.1)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)