Maintenance: Update dependency dalli to v3.2.8

Gemfile.lock

@@ -189,8 +189,7 @@ GEM
     crass (1.0.6)
     csv (3.2.8)
     daemons (1.4.1)
-    dalli (3.2.7)
-      base64
+    dalli (3.2.8)
     date (3.3.4)
     debug_inspector (1.1.0)
     delayed_job (4.1.11)