mpiFileUtils: Add missing dependency with attr. (#29886)

This was added in version 0.11.1.

var/spack/repos/builtin/packages/mpifileutils/package.py

@@ -48,6 +48,8 @@ class Mpifileutils(Package):
     depends_on('libarchive')
     depends_on('libarchive@3.5.1:', when='@0.11:')
 
+    depends_on('attr', when='@0.11.1:+xattr')
+
     depends_on('bzip2')
 
     depends_on('libcap')