[Security] Bump brakeman from 4.7.0 to 4.7.1

Bumps [brakeman](https://github.com/presidentbeef/brakeman) from 4.7.0 to 4.7.1. **This update includes a security fix.**
- [Release notes](https://github.com/presidentbeef/brakeman/releases)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/master/CHANGES.md)
- [Commits](presidentbeef/brakeman@v4.7.0...v4.7.1)

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

Gemfile.lock

@@ -53,7 +53,7 @@ GEM
     bindex (0.8.1)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    brakeman (4.7.0)
+    brakeman (4.7.1)
     browser (2.6.1)
     builder (3.2.3)
     bullet (6.0.2)