mail/dovecot-fts-flatcurve: Update 1.0.3 → 1.0.4

Changes per upstream:

• Fix issues with long/malformed strings when indexing
• Add fts_flatcurve_index_truncate event

Changelog:
https://github.com/slusarz/dovecot-fts-flatcurve/releases/tag/v1.0.4
Commit log:
https://github.com/slusarz/dovecot-fts-flatcurve/compare/v1.0.3...v1.0.4

PR: 280888
MFH: 2024Q3