[GHA] Uplift Linux IGC Dev RT version to igc-dev-7b8b6da#19912

bb-sycl wants to merge 1 commit intosyclintel/llvm:syclfrom

ci/update_gpu_driver-linux-igc-dev-7b8b6daintel/llvm:ci/update_gpu_driver-linux-igc-dev-7b8b6daCopy head branch name to clipboard