Bump brakeman from 4.5.0 to 4.5.1

Bumps [brakeman](https://github.com/presidentbeef/brakeman) from 4.5.0 to 4.5.1.
- [Release notes](https://github.com/presidentbeef/brakeman/releases)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/master/CHANGES.md)
- [Commits](presidentbeef/brakeman@v4.5.0...v4.5.1)

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

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
       actionpack (>= 4.0)
     benchmark-ips (2.7.2)
     bindex (0.5.0)
-    brakeman (4.5.0)
+    brakeman (4.5.1)
     builder (3.2.3)
     byebug (11.0.1)
     capybara (3.18.0)