www/kanboard: update to 1.2.40

ChangeLog: https://github.com/kanboard/kanboard/releases/tag/v1.2.40

• build(deps): bump symfony/finder from 5.4.42 to 5.4.43
• chore: add php83-xmlwriter package to the Docker image
• ci: update GitHub pull-request template
• fix: avoid PHP error if no subtask in progress is found
• fix: avoid potential XSS and HTML injection in comment replies
• fix: prevent duplicated columns when enabling per-swimlane column task limits
• fix(api): check comment visibility in API procedures
• fix(api): verify comment ownership in API procedures
• fix(mssql): escape identifiers in timesheet queries
• fix(mssql): use ANSI OFFSET/FETCH syntax for pagination queries
• fix(test): use explicit ORDER BY for queries returning multiple rows
• test: add unit tests for Subtask Time Tracking query methods
• test: ensure pagination produces correct chunks

Reported by: portscout