Bump acorn from 7.3.1 to 7.4.0

Bumps [acorn](https://github.com/acornjs/acorn) from 7.3.1 to 7.4.0.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/7.3.1...7.4.0)

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

package.json

@@ -74,7 +74,7 @@
 		"@nextcloud/eslint-plugin": "^1.4.0",
 		"@nextcloud/webpack-vue-config": "^1.1.0",
 		"@vue/test-utils": "^1.0.3",
-		"acorn": "^7.3.1",
+		"acorn": "^7.4.0",
 		"babel-eslint": "^10.1.0",
 		"babel-jest": "^26.2.2",
 		"babel-loader": "^8.1.0",