Fix date-released to 2026-02-17

Correct the date-released format in CITATION.cff.

Author: jfy133

CITATION.cff

@@ -69,7 +69,7 @@ authors:
 title: "Introduction to Ancient Metagenomics"
 version: 2025.2
 doi: 10.5281/zenodo.17736308
-date-released: 2026-17-17
+date-released: 2026-02-17
 license: CC-BY-4.0
 license_url: https://github.com/SPAAM-community/intro-to-ancient-metagenomics-book/blob/2025.1/LICENSE
 keywords: