Update from shakapacker v6.0.0.rc13 to v6.5.0

Using a two-step process is recommended:
332e25186a/docs/v6_upgrade.md

Gemfile.lock

@@ -464,7 +464,7 @@ GEM
     sentry-ruby (5.4.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
     set (1.0.2)
-    shakapacker (6.0.0.rc.13)
+    shakapacker (6.5.0)
       activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)
@@ -611,7 +611,7 @@ DEPENDENCIES
   selenium-webdriver
   sentry-rails
   sentry-ruby
-  shakapacker (= 6.0.0.rc13)
+  shakapacker (= 6.5)
   shoulda-matchers
   simplecov
   slim-rails
@@ -625,4 +625,4 @@ DEPENDENCIES
   whenever
 
 BUNDLED WITH
-   2.3.19
+   2.3.17