chore(deps): update dependency sprockets to v3.7.3

Author: renovate[bot]

Gemfile.lock

@@ -111,7 +111,8 @@ GEM
       rack-protection (= 3.2.0)
       sinatra (= 3.2.0)
       tilt (~> 2.0)
-    sprockets (3.7.2)
+    sprockets (3.7.3)
+      base64
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-helpers (1.4.0)