[CI] Roll back intel driver to the latest version (#5925)

Revert accidentally committed change in a618ca7.

Author: bader

.github/workflows/sycl_linux_build_and_test.yml

@@ -39,7 +39,7 @@ on:
       intel_drivers_image:
         type: string
         required: false
-        default: "ghcr.io/intel/llvm/ubuntu2004_intel_drivers:unstable"
+        default: "ghcr.io/intel/llvm/ubuntu2004_intel_drivers:latest"
       lts_config:
         type: string
         required: false