Bump sinatra from 2.0.8.1 to 2.2.3

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
     minitest (5.14.4)
     multi_json (1.14.1)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     nokogiri (1.12.4)
@@ -120,8 +120,8 @@ GEM
     puma (4.3.8)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -159,7 +159,7 @@ GEM
     redis (4.1.4)
     rollbar (2.15.6)
       multi_json
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     sass-rails (6.0.0)
       sassc-rails (~> 2.1, >= 2.1.1)
     sassc (2.4.0)
@@ -178,10 +178,10 @@ GEM
     simple_form (5.0.2)
       actionpack (>= 5.0)
       activemodel (>= 5.0)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     spring (1.7.2)
     sprockets (4.0.2)
@@ -193,7 +193,7 @@ GEM
       sprockets (>= 3.0.0)
     thor (1.1.0)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (4.2.0)