Drop invalid reference to ribchester

Drop invalid reference to ribchester.yaml as it is not longer supported
in v2022dev3.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

lava/group-modules-tpl.yaml

@@ -43,11 +43,6 @@
           from: git
           path: test-cases/rhosydd.yaml
           name: rhosydd
-        - repository: https://gitlab.apertis.org/tests/apertis-test-cases.git
-          revision: 'apertis/v2022dev3'
-          from: git
-          path: test-cases/ribchester.yaml
-          name: ribchester
         - repository: https://gitlab.apertis.org/tests/apertis-test-cases.git
           revision: 'apertis/v2022dev3'
           from: git