Merge pull request #431 from citizensadvice/dependabot/bundler/rack-session-2.1.2

[dependabot:bundler] bump rack-session from 2.1.1 to 2.1.2

Author: KPobeeNorris

Gemfile.lock

@@ -257,7 +257,7 @@ GEM
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.2.6)
-    rack-session (2.1.1)
+    rack-session (2.1.2)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)