Relax peer dependency minimum versions to original [email protected] …

…versions.

[email protected] shipped with `qunit: ^2.13.0` and `@ember/test-helpers: ^2.1.0`.
However, when Dependabot landed a dependency update for our internal
dev dependencies it also increased the minimum for the peerDep (in
719af61
and
fd9fa19)
both of which were released in [email protected].

Changing the minimum version of a peer dependency that we enforce (via
`validatePeerDependencies`) should be considered a breaking change!

This reverts that change and sets the peer dependencies back to its value
when 5.0.0 was published.

package.json

@@ -68,8 +68,8 @@
     "release-it-lerna-changelog": "^3.1.0"
   },
   "peerDependencies": {
-    "@ember/test-helpers": "^2.2.3",
-    "qunit": "^2.14.0"
+    "@ember/test-helpers": "^2.1.0",
+    "qunit": "^2.13.0"
   },
   "engines": {
     "node": "10.* || 12.* || >= 14.*"