[BUGFIX release] Fix destructors in {{each}}

This incorporates a bugfix within the VM for `{{each}}` destructors.
Before this fix, since the VM upgrade, destructors on items added to an
each _after_ initial render would never run.

(cherry picked from commit aa3634a)

Author: Chris Garrett

package.json

@@ -74,15 +74,15 @@
   },
   "devDependencies": {
     "@babel/preset-env": "^7.9.0",
-    "@glimmer/compiler": "^0.48.0",
+    "@glimmer/compiler": "^0.49.0",
     "@glimmer/env": "^0.1.7",
-    "@glimmer/interfaces": "^0.48.0",
-    "@glimmer/node": "^0.48.0",
-    "@glimmer/opcode-compiler": "^0.48.0",
-    "@glimmer/program": "^0.48.0",
-    "@glimmer/reference": "^0.48.0",
-    "@glimmer/runtime": "^0.48.0",
-    "@glimmer/validator": "^0.48.0",
+    "@glimmer/interfaces": "^0.49.0",
+    "@glimmer/node": "^0.49.0",
+    "@glimmer/opcode-compiler": "^0.49.0",
+    "@glimmer/program": "^0.49.0",
+    "@glimmer/reference": "^0.49.0",
+    "@glimmer/runtime": "^0.49.0",
+    "@glimmer/validator": "^0.49.0",
     "@simple-dom/document": "^1.4.0",
     "@types/qunit": "^2.5.4",
     "@types/rsvp": "^4.0.3",