Include mass_attenuation.h5 in package data (#3936)

Author: paulromano

pyproject.toml

@@ -69,7 +69,7 @@ include = ['openmc*']
 exclude = ['tests*']
 
 [tool.setuptools.package-data]
-"openmc.data.dose" = ["**/*.txt"]
+"openmc.data.dose" = ["**/*.txt", "*.h5"]
 "openmc.data" = ["*.txt", "*.DAT", "*.json", "*.h5"]
 "openmc.lib" = ["libopenmc.dylib", "libopenmc.so"]