build(deps): bump mustermann from 3.1.0 to 3.1.1 (#5037)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -316,7 +316,7 @@ GEM
     multipart-parser (0.1.1)
     multipart-post (2.4.1)
     mustache (1.1.2)
-    mustermann (3.1.0)
+    mustermann (3.1.1)
     mutex_m (0.3.0)
     mysql2 (0.5.7)
       bigdecimal