Bump sinatra from 2.0.8.1 to 3.0.4

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.0.8.1 to 3.0.4.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.0.8.1...v3.0.4)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: indirect
...

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

Gemfile.lock

@@ -232,7 +232,7 @@ GEM
       mongoid (>= 2.0)
     multi_json (1.14.1)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.3)
     netrc (0.11.0)
@@ -248,10 +248,10 @@ GEM
     puma (4.3.3)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.4)
     rack-contrib (2.1.0)
       rack (~> 2.0)
-    rack-protection (2.0.8.1)
+    rack-protection (3.0.4)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -300,7 +300,7 @@ GEM
       rubyzip (>= 1.3.0, < 3.0.0)
     ruby-vips (2.0.17)
       ffi (~> 1.9)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     rubyXL (3.4.12)
       nokogiri (>= 1.4.4)
       rubyzip (>= 1.3.0)
@@ -344,10 +344,10 @@ 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 (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     socksify (1.7.1)
     soulmate (1.1.0)
@@ -369,7 +369,7 @@ GEM
     temple (0.8.2)
     thor (1.1.0)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     trollop (2.9.10)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)