Bump split from 3.4.0 to 3.4.1

Bumps [split](https://github.com/splitrb/split) from 3.4.0 to 3.4.1.
- [Release notes](https://github.com/splitrb/split/releases)
- [Changelog](https://github.com/splitrb/split/blob/master/CHANGELOG.md)
- [Commits](splitrb/split@v3.4.0...v3.4.1)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
       rack (~> 2.0)
       rack-protection (= 2.0.7)
       tilt (~> 2.0)
-    split (3.4.0)
+    split (3.4.1)
       redis (>= 2.1)
       simple-random (>= 0.9.3)
       sinatra (>= 1.2.6)