Add a comment to state reason of pinning

Author: antonwolfy

environments/build_conda_pkg.yml

@@ -4,4 +4,4 @@ channels:
 dependencies:
   - python=3.12 # conda-build does not support python 3.13
   - conda-build=25.3.1
-  - libxml2=2.13.7
+  - libxml2=2.13.7 # libs dependency issue in 2.14.0