chore: bump version to v2.5.0

Tag v2.4.2 already existed (manual tag by Filippi for the JOSS/MesoNH
sync), ahead of Version.h's v2.3.0. Bumping to v2.5.0 to mark the
pip-installable wheels release and keep Version.h, the git tag, and
the PyPI version in sync going forward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: antonio-leblanc

src/include/Version.h

@@ -1,3 +1,3 @@
 #pragma once
-const char* ff_version = "v2.3.0";
+const char* ff_version = "v2.5.0";