www/kanboard: update to 1.2.30

ChangeLog: https://github.com/kanboard/kanboard/releases/tag/v1.2.30

• CVE-2023-33956: Parameter based Indirect Object Referencing leading to private file exposure
• CVE-2023-33968: Missing access control allows user to move and duplicate tasks to any project in the software
• CVE-2023-33969: Stored XSS in the Task External Link Functionality
• CVE-2023-33970: Missing access control in internal task links feature
• Avoid PHP warning caused by session_regenerate_id()
• Avoid CSS issue when upgrading to v1.2.29 without flushing user sessions

Reported by: portscout
MFH: 2023Q2 (security release)
Security: CVE-2023-33956 CVE-2023-33968 CVE-2023-33969 CVE-2023-33970

(cherry picked from commit ad5f302a4937b0056b9f6744c11be67482da1fe5)