palisade: add a named version for the "fppe-logreg" branch (#28544)

Co-authored-by: John Wohlbier <jgwohlbier@sei.cmu.edu>

var/spack/repos/builtin/packages/palisade-development/package.py

@@ -30,6 +30,8 @@ class PalisadeDevelopment(CMakePackage):
 
     version('feature-fixed-point-encoding',
             branch='feature-fixed-point-encoding')
+    version('fppe-logreg',
+            branch='fppe-logreg')
     version('master', branch='master', preferred=True)
 
     variant('shared', default=True, description='Build shared library.')