Update CHANGELOG.md

Author: james-baker-aera

CHANGELOG.md

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 # CheckStyle-IDEA Changelog
 
-* **5.108.0** New: Added Checkstyle 10.25.1.
+* **5.108.0** New: Added Checkstyle 10.25.1 & 10.26.0.
 * **5.107.0** New: Added Checkstyle 10.25.0.
 * **5.106.0** New: Added Checkstyle 10.24.0.
 * **5.106.0** New: Now built against IDEA 2024.1.7 (was 2023.1.5).