Bump sinatra from 2.2.0 to 2.2.3

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.2.0 to 2.2.3.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v2.2.0...v2.2.3)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:development
...

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

Gemfile.lock

@@ -101,7 +101,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     minitest (5.16.2)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     net-imap (0.2.3)
       digest
@@ -126,7 +126,7 @@ GEM
       racc (~> 1.4)
     racc (1.6.0)
     rack (2.2.4)
-    rack-protection (2.2.0)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -179,10 +179,10 @@ GEM
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
+    sinatra (2.2.3)
-      mustermann (~> 1.0)
+      mustermann (~> 2.0)
       rack (~> 2.2)
-      rack-protection (= 2.2.0)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     sprockets (4.1.1)
       concurrent-ruby (~> 1.0)
@@ -195,7 +195,7 @@ GEM
     strscan (3.0.4)
     temple (0.8.2)
     thor (1.2.1)
-    tilt (2.0.10)
+    tilt (2.0.11)
     timecop (0.9.5)
     timeout (0.3.0)
     tzinfo (2.0.4)