Bump rack from 3.1.17 to 3.1.18 in the bundler group across 1 directory

Bumps the bundler group with 1 update in the / directory: [rack](https://github.com/rack/rack).


Updates `rack` from 3.1.17 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@v3.1.17...v3.1.18)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -146,7 +146,7 @@ GEM
       date
       stringio
     racc (1.8.1)
-    rack (3.1.17)
+    rack (3.1.18)
     rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)