Bump conda-build version (#2424)

This PR bumps `conda-build` version from 25.3.2 to 25.4.2.

Author: antonwolfy

environments/build_conda_pkg.yml

@@ -3,4 +3,4 @@ channels:
   - conda-forge
 dependencies:
   - python=3.12 # conda-build does not support python 3.13
-  - conda-build=25.3.2
+  - conda-build=25.4.2