Bump acorn from 7.2.0 to 7.3.1

Bumps [acorn](https://github.com/acornjs/acorn) from 7.2.0 to 7.3.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/7.2.0...7.3.1)

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

package.json

@@ -73,7 +73,7 @@
 		"@nextcloud/eslint-config": "^2.0.0",
 		"@nextcloud/eslint-plugin": "^1.4.0",
 		"@vue/test-utils": "^1.0.3",
-		"acorn": "^7.2.0",
+		"acorn": "^7.3.1",
 		"babel-eslint": "^10.1.0",
 		"babel-jest": "^26.0.1",
 		"babel-loader": "^8.1.0",