Bump rack from 2.2.6.2 to 2.2.6.3

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 to 2.2.6.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.6.2...v2.2.6.3)

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

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

Gemfile.lock

@@ -1,6 +1,11 @@
 GEM
-  remote: https://rubygems.org/
   remote: https://rails-assets.org/
+  specs:
+    rails-assets-leaflet (1.5.1)
+    rails-assets-markdown-it (9.0.1)
+
+GEM
+  remote: https://rubygems.org/
   specs:
     actioncable (6.0.6.1)
       actionpack (= 6.0.6.1)
@@ -460,7 +465,7 @@ GEM
     puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.6.1)
-    rack (2.2.6.2)
+    rack (2.2.6.3)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-protection (2.2.2)
@@ -484,8 +489,6 @@ GEM
       bundler (>= 1.3.0)
       railties (= 6.0.6.1)
       sprockets-rails (>= 2.0.0)
-    rails-assets-leaflet (1.5.1)
-    rails-assets-markdown-it (9.0.1)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)