Bump rack from 3.1.15 to 3.1.16

Bumps [rack](https://github.com/rack/rack) from 3.1.15 to 3.1.16.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.15...v3.1.16)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
       pry (>= 0.13, < 0.15)
     public_suffix (5.1.1)
     racc (1.8.1)
-    rack (3.1.15)
+    rack (3.1.16)
     rack-test (2.2.0)
       rack (>= 1.3)
     rainbow (3.1.1)