Pin dependency @release-it-plugins/lerna-changelog to 7.0.0

Author: renovate[bot]

package.json

@@ -43,7 +43,7 @@
     "@eslint/js": "9.22.0",
     "@glimmer/component": "2.0.0",
     "@glimmer/tracking": "1.1.2",
-    "@release-it-plugins/lerna-changelog": "^7.0.0",
+    "@release-it-plugins/lerna-changelog": "7.0.0",
     "broccoli-asset-rev": "3.0.0",
     "concurrently": "9.1.2",
     "ember-cli": "6.2.3",