fix: fix @commitlint/core imports

The commitlint core doesn't correctly export the default exports from its constituent dependencies.

ref conventional-changelog/commitlint#645

src/lint-commits.plugin.js

@@ -1,7 +1,12 @@
 import * as config from '@commitlint/config-conventional';
-import { format, lint, load } from '@commitlint/core';
+import * as commitlint from '@commitlint/core';
 import SemanticReleaseError from '@semantic-release/error';
 
+import interopRequireDefault from '@babel/runtime/helpers/interopRequireDefault';
+const format = interopRequireDefault(commitlint.format).default,
+  lint = interopRequireDefault(commitlint.lint).default,
+  load = interopRequireDefault(commitlint.load).default;
+
 export async function verifyRelease(repoData, options) {
   return validateCommits(options);
 }