Update rack-session to version 2.1.1 (#1306)

Author: depfu[bot]

Gemfile.lock

@@ -230,8 +230,8 @@ GEM
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (3.1.13)
-    rack-session (2.1.0)
+    rack (3.1.14)
+    rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-ssl (1.4.1)