Release 6.4

Author: jaredgalanis

source/ember-cli-changes/6.4.md

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+---
+version: "6.4"
+changes:
+  -
+    feature: true
+    title: "Update ember-try to v4 in blueprints"
+    link: "https://blog.emberjs.com/ember-released-6-4"
+---

source/ember-data-changes/5.4.md

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+---
+version: "5.4"
+changes:
+---

source/ember-js-changes/6.4.md

@@ -0,0 +1,8 @@
+---
+version: "6.4"
+changes:
+  -
+    feature: true
+    title: "Drop support for TypeScript 4.9 to allow for glimmer-vm upgrade"
+    link: "https://blog.emberjs.com/ember-released-6-4"
+---