update CI to prettify oss-attribution

- also fix TS warnings in invidiousCI.ts

ci/prettify.ts

@@ -0,0 +1,6 @@
+import { writeFile } from 'fs';
+
+import * as license from "../oss-attribution/licenseInfos.json";
+
+const result = JSON.stringify(license, null, 2);
+writeFile("../oss-attribution/licenseInfos.json", result, err => { if (err) return console.log(err) } );