Update spring to version 4.4.2

Author: depfu[bot]

Gemfile.lock

@@ -401,7 +401,7 @@ GEM
     sorted_set (1.0.3)
       rbtree
       set (~> 1.0)
-    spring (4.4.0)
+    spring (4.4.2)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)