Bump rack-session from 2.0.0 to 2.1.1

Bumps [rack-session](https://github.com/rack/rack-session) from 2.0.0 to 2.1.1.
- [Release notes](https://github.com/rack/rack-session/releases)
- [Changelog](https://github.com/rack/rack-session/blob/v2.1.1/releases.md)
- [Commits](rack/rack-session@v2.0.0...v2.1.1)

---
updated-dependencies:
- dependency-name: rack-session
  dependency-version: 2.1.1
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -91,7 +91,8 @@ GEM
     public_suffix (6.0.0)
     racc (1.8.1)
     rack (3.1.16)
-    rack-session (2.0.0)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)