Update dependency sinatra to v4 [SECURITY]

Author: renovate[bot]

Gemfile.lock

@@ -58,7 +58,7 @@ GEM
     mini_portile2 (2.8.7)
     minitest (5.25.1)
     multi_json (1.15.0)
-    mustermann (3.0.0)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     newrelic_rpm (8.16.0)
     nokogiri (1.16.7)
@@ -133,7 +133,7 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
     thor (1.3.2)
-    tilt (2.3.0)
+    tilt (2.4.0)
     tty-pager (0.14.0)
       strings (~> 0.2.0)
       tty-screen (~> 0.8)