test-spec: update deps for CI-mesh-test

tests/subsys/bluetooth/mesh are not used at downstream, remove it.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>

Author: nordic-piks

.github/test-spec.yml

@@ -231,7 +231,6 @@
 "CI-mesh-test":
   - "subsys/bluetooth/mesh/**/*"
   - "include/bluetooth/mesh/**/*"
-  - "tests/subsys/bluetooth/mesh/**/*"
   - "samples/bluetooth/mesh/**/*"
   - "scripts/requirements-fixed.txt"