chore(deps-dev): bump ember-source from 3.20.2 to 3.20.3 (#4680)

Bumps [ember-source](https://github.com/emberjs/ember.js) from 3.20.2 to 3.20.3.
- [Release notes](https://github.com/emberjs/ember.js/releases)
- [Changelog](https://github.com/emberjs/ember.js/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember.js@v3.20.2...v3.20.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package.json

@@ -122,7 +122,7 @@
     "ember-router-scroll": "^3.3.2",
     "ember-simple-auth": "^3.0.0",
     "ember-simple-auth-token": "^5.1.1",
-    "ember-source": "~3.20.2",
+    "ember-source": "~3.20.3",
     "ember-table": "^2.2.3",
     "ember-template-lint": "^2.9.1",
     "ember-truth-helpers": "^2.1.0",

yarn.lock

@@ -7417,10 +7417,10 @@ ember-source-channel-url@^2.0.1:
   dependencies:
     got "^8.0.1"
 
-ember-source@~3.20.2:
-  version "3.20.2"
-  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.20.2.tgz#c8ea4fd43230ae91e9362c3136b37ed9bdd91c2a"
-  integrity sha512-9uPBKF7B7doz6u0z+0vBczGqaAVpcGmjqQkZdtf0C0aYY7NXRYDMZrx7vudy5DRhP13Ryo4rjZhlcRgbFPR44w==
+ember-source@~3.20.3:
+  version "3.20.3"
+  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.20.3.tgz#fdc0e8d9a402985783a2c53729f75abbb7b2ac95"
+  integrity sha512-Fpz0eVFcL4s74d2mw5D3RFGlhRcljB6N4RyjsuumwYTlg7UMrkDdlHy7A1ZI2tDw2Cz7uE7W2dKzSnCQcZGcVQ==
   dependencies:
     "@babel/helper-module-imports" "^7.8.3"
     "@babel/plugin-transform-block-scoping" "^7.8.3"