chore(deps): update dependency sinatra-contrib to v3.0.6

Gemfile.lock

@@ -71,7 +71,7 @@ GEM
       pry (>= 0.13, < 0.15)
     racc (1.6.2)
     rack (2.2.6.4)
-    rack-protection (3.0.5)
+    rack-protection (3.0.6)
       rack
     rack-ssl-enforcer (0.2.9)
     rack-test (2.1.0)
@@ -91,16 +91,16 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sinatra (3.0.5)
+    sinatra (3.0.6)
       mustermann (~> 3.0)
       rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.5)
+      rack-protection (= 3.0.6)
       tilt (~> 2.0)
-    sinatra-contrib (3.0.5)
+    sinatra-contrib (3.0.6)
       multi_json
       mustermann (~> 3.0)
-      rack-protection (= 3.0.5)
-      sinatra (= 3.0.5)
+      rack-protection (= 3.0.6)
+      sinatra (= 3.0.6)
       tilt (~> 2.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)