[SYCL] Checkout fixed version of Level Zero loader

Checkout fixed version of the Level Zero loader instead of checking out
master. Otherwise major changes in the headers can cause build
failures.

Signed-off-by: Artur Gainullin <[email protected]>

Author: againull

sycl/plugins/level_zero/CMakeLists.txt

@@ -23,7 +23,7 @@ if (NOT DEFINED L0_LIBRARY OR NOT DEFINED L0_INCLUDE_DIR)
   endif()
   ExternalProject_Add(l0-loader
     GIT_REPOSITORY    https://github.com/oneapi-src/level-zero.git
-    GIT_TAG           origin/master
+    GIT_TAG           v0.91.21
     UPDATE_DISCONNECTED ${SYCL_EP_L0_LOADER_SKIP_AUTO_UPDATE}
     SOURCE_DIR        ${L0_LOADER_SOURCE_DIR}
     BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/l0_loader_build"