Bump rack from 2.2.8.1 to 2.2.18 in /source/scripts/ruby/blog/source

Bumps [rack](https://github.com/rack/rack) from 2.2.8.1 to 2.2.18.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.8.1...v2.2.18)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.18
  dependency-type: indirect
...

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

Author: dependabot[bot]

source/scripts/ruby/blog/source/Gemfile.lock

@@ -83,7 +83,7 @@ GEM
     puma (5.6.9)
       nio4r (~> 2.0)
     racc (1.7.3)
-    rack (2.2.8.1)
+    rack (2.2.18)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.7.2)