ci: raise the log level threshold of spirv logs
Avoid the wall of "Unsupported SPIR-V capability" warnings in CI job log, hiding away useful output: ERROR - dEQP error: SPIR-V WARNING: ERROR - dEQP error: In file ../src/compiler/spirv/spirv_to_nir.c:4779 ERROR - dEQP error: Unsupported SPIR-V capability: SpvCapabilityDrawParameters (4427) ERROR - dEQP error: 28 bytes into the SPIR-V binary Part-of: <!28503>