Bump rack-session from 2.1.0 to 2.1.1 (#3072)

Bumps [rack-session](https://github.com/rack/rack-session) from 2.1.0 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](https://github.com/rack/rack-session/compare/v2.1.0...v2.1.1)

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

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Gemfile.lock

@@ -348,7 +348,7 @@ GEM
       rack (>= 1.0, < 4)
     rack-mini-profiler (3.3.1)
       rack (>= 1.2.0)
-    rack-session (2.1.0)
+    rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)