Bump rack from 3.1.0 to 3.1.3 (#150)

Bumps [rack](https://github.com/rack/rack) from 3.1.0 to 3.1.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.0...v3.1.3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -30,7 +30,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     racc (1.8.0)
-    rack (3.1.0)
+    rack (3.1.3)
     rack-protection (4.0.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0, < 4)