[publify_core] Improper Access Control in publify

A low-privileged user can modify and delete admin articles just by changing the value of the article[id] parameter prior to 9.2.9.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-1810
• https://github.com/publify/publify/commit/c0aba87844d1e47da50c0d99a3465164a4d244ce
• https://huntr.dev/bounties/9b2d7579-032e-42da-b736-4b10a868eacb
• https://github.com/advisories/GHSA-c273-c6vg-4pv5