libyogrt: remove conflicts triggered by an invalid value (#20794)

fixes #20611

The conflict was triggered by an invalid value of the
'scheduler' variant. This causes Spack to error when libyogrt
facts are validated by the ASP-based concretizer.

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

@@ -34,13 +34,11 @@ class Libyogrt(AutotoolsPackage):
     variant('scheduler', default='system',
             description="Select scheduler integration",
             values=['system', 'slurm'], multi=False)
-    depends_on('slurm', when='scheduler=slurm')
-
-    conflicts('scheduler=lsf', when='@:1.22')
-
     variant('static', default='False',
             description="build static library")
 
+    depends_on('slurm', when='scheduler=slurm')
+
     def url_for_version(self, version):
         if version < Version(1.21):
             return "https://github.com/LLNL/libyogrt/archive/%s.tar.gz" % version