Update rack-session (2.1.1 -> 2.1.2) for security fix

Author: anumol-baby

Gemfile.lock

@@ -218,7 +218,7 @@ 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)