Bump rack from 3.1.4 to 3.1.6

Bumps [rack](https://github.com/rack/rack) from 3.1.4 to 3.1.6.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.4...v3.1.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    network_resiliency (0.8.2)
+    network_resiliency (0.0.1)
 
 GEM
   remote: https://rubygems.org/
@@ -170,7 +170,7 @@ GEM
     psych (5.1.2)
       stringio
     racc (1.8.0)
-    rack (3.1.4)
+    rack (3.1.6)
     rack-session (2.0.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)