chore(deps-dev): bump ember-source from 3.20.3 to 3.20.4 (#4746)

Bumps [ember-source](https://github.com/emberjs/ember.js) from 3.20.3 to 3.20.4.
- [Release notes](https://github.com/emberjs/ember.js/releases)
- [Changelog](https://github.com/emberjs/ember.js/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember.js@v3.20.3...v3.20.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

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

package.json

@@ -123,7 +123,7 @@
     "ember-router-scroll": "^3.3.3",
     "ember-simple-auth": "^3.0.0",
     "ember-simple-auth-token": "^5.1.1",
-    "ember-source": "~3.20.3",
+    "ember-source": "~3.20.4",
     "ember-table": "^2.2.3",
     "ember-template-lint": "^2.10.0",
     "ember-truth-helpers": "^2.1.0",

yarn.lock

@@ -7427,10 +7427,10 @@ ember-source-channel-url@^2.0.1:
   dependencies:
     got "^8.0.1"
 
-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==
+ember-source@~3.20.4:
+  version "3.20.4"
+  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.20.4.tgz#582545ae3b20de5ffd9f8b43c42c94815e592291"
+  integrity sha512-ycWlaq7W63S3Nh7pMRU4oXNirBB9MbNGDN6hUgs3/qc1gjOUVGfGv0p2NPVcKXgqWtbiqrWGqCbp1iTay2MUpA==
   dependencies:
     "@babel/helper-module-imports" "^7.8.3"
     "@babel/plugin-transform-block-scoping" "^7.8.3"