Bump ember-template-lint from 2.19.0 to 2.21.0

Bumps [ember-template-lint](https://github.com/ember-template-lint/ember-template-lint) from 2.19.0 to 2.21.0.
- [Release notes](https://github.com/ember-template-lint/ember-template-lint/releases)
- [Changelog](https://github.com/ember-template-lint/ember-template-lint/blob/master/CHANGELOG.md)
- [Commits](ember-template-lint/ember-template-lint@v2.19.0...v2.21.0)

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

Author: dependabot-preview[bot]

package.json

@@ -51,7 +51,7 @@
     "ember-resolver": "^8.0.2",
     "ember-source": "~3.20.4",
     "ember-source-channel-url": "^3.0.0",
-    "ember-template-lint": "^2.19.0",
+    "ember-template-lint": "^2.21.0",
     "ember-try": "^1.4.0",
     "eslint": "^7.20.0",
     "eslint-plugin-ember": "^9.6.0",

yarn.lock

@@ -4659,10 +4659,10 @@ ember-source@~3.20.4:
     semver "^6.1.1"
     silent-error "^1.1.1"
 
-ember-template-lint@^2.19.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/ember-template-lint/-/ember-template-lint-2.19.0.tgz#e493942ffc67cae9b1f11e0ec776dcc58c8aab02"
-  integrity sha512-x1cX8VLY2J4uMpFtn/hSGvBYNwRLV0w3Wnw02KetMGwuwdo214fVH/X95UDLZlBMPQL1yk0WAVwAd2qrNmE0Gg==
+ember-template-lint@^2.21.0:
+  version "2.21.0"
+  resolved "https://registry.yarnpkg.com/ember-template-lint/-/ember-template-lint-2.21.0.tgz#7e120abf309a8810eeed26c52377943faf15a95b"
+  integrity sha512-19QbEqJQdMfcRS7PsQsubflRowEtnkbD0tpYR4q/xq4lodmhU7hhOFvlTQgbxD/jwW5Ur+tkOwH4KFy9JwOyXA==
   dependencies:
     chalk "^4.0.0"
     ember-template-recast "^5.0.1"