Bump rack-protection from 2.2.0 to 2.2.1 (#2507)

Bumps [rack-protection](https://github.com/sinatra/sinatra) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/v2.2.1/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v2.2.0...v2.2.1)

---
updated-dependencies:
- dependency-name: rack-protection
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

Gemfile.lock

@@ -100,7 +100,7 @@ GEM
       msgpack (~> 1)
     msgpack (1.5.2)
     multipart-post (2.2.3)
-    mustermann (1.1.1)
+    mustermann (1.1.2)
       ruby2_keywords (~> 0.0.1)
     naught (1.1.0)
     netrc (0.11.0)
@@ -129,7 +129,7 @@ GEM
       rqrcode_core (~> 0.1)
     racc (1.6.0)
     rack (2.2.3.1)
-    rack-protection (2.2.0)
+    rack-protection (2.2.1)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -185,10 +185,10 @@ GEM
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
     simple_oauth (0.3.1)
-    sinatra (2.2.0)
+    sinatra (2.2.1)
       mustermann (~> 1.0)
       rack (~> 2.2)
-      rack-protection (= 2.2.0)
+      rack-protection (= 2.2.1)
       tilt (~> 2.0)
     slack-notifier (2.4.0)
     sqlite3 (1.4.4)