Bump rack from 3.1.16 to 3.1.18

Bumps [rack](https://github.com/rack/rack) from 3.1.16 to 3.1.18.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.16...v3.1.18)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.18
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -112,7 +112,7 @@ GEM
     parallel (1.27.0)
     parslet (2.0.0)
     public_suffix (6.0.1)
-    rack (3.1.16)
+    rack (3.1.18)
     rack-proxy (0.7.7)
       rack
     rackup (2.2.1)