Bump sinatra from 2.2.2 to 3.0.0 (#399)

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.2.2 to 3.0.0.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.2.2...v3.0.0)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -74,7 +74,7 @@ GEM
     mocha-on-bacon (0.2.2)
       mocha (>= 0.13.0)
     multi_json (1.15.0)
-    mustermann (2.0.2)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nap (1.1.0)
     net-imap (0.2.3)
@@ -111,7 +111,7 @@ GEM
     rack (2.2.4)
     rack-attack (6.6.1)
       rack (>= 1.0, < 3)
-    rack-protection (2.2.2)
+    rack-protection (3.0.0)
       rack
     rack-ssl (1.4.1)
       rack
@@ -155,16 +155,16 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     sequel (5.60.1)
-    sinatra (2.2.2)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.2)
+    sinatra (3.0.0)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.2.2)
+    sinatra-contrib (3.0.0)
       multi_json
-      mustermann (~> 2.0)
-      rack-protection (= 2.2.2)
-      sinatra (= 2.2.2)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.0)
+      sinatra (= 3.0.0)
       tilt (~> 2.0)
     sinatra-twitter-bootstrap (2.3.4)
     slim (4.1.0)