Update RFC 0774 ready-for-release PR URL

Ember.js RFCS CI · achambers · commit 194d987d2f63 · 2023-09-01T15:07:33.000+01:00
diff --git a/text/0774-implicit-record-route-loading.md b/text/0774-implicit-record-route-loading.md
@@ -7,6 +7,7 @@ teams:
   - framework
 prs:
   accepted: 'https://github.com/emberjs/rfcs/pull/774'
+  ready-for-release: 'https://github.com/emberjs/rfcs/pull/900'
 ---
 
 # Deprecate Implicit Record Loading in Routes
