Update dependency ember-cli-mirage to v3.0.0 (#7239)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -86,7 +86,7 @@
     "ember-cli-head": "2.0.0",
     "ember-cli-htmlbars": "6.3.0",
     "ember-cli-inject-live-reload": "2.1.0",
-    "ember-cli-mirage": "3.0.0-alpha.5",
+    "ember-cli-mirage": "3.0.0",
     "ember-cli-notifications": "8.0.0",
     "ember-click-outside": "6.0.1",
     "ember-concurrency": "3.1.1",