[UR] Update UR SHA to change unions to std::variant (#11539)

Update UR SHA to oneapi-src/unified-runtime#961
change unions to std::variant in the HIP and CUDA adapters.

---------

Co-authored-by: Kenneth Benzie (Benie) <k.benzie83@gmail.com>

sycl/plugins/unified_runtime/CMakeLists.txt

@@ -54,13 +54,13 @@ if(SYCL_PI_UR_USE_FETCH_CONTENT)
   include(FetchContent)
 
   set(UNIFIED_RUNTIME_REPO "https://github.com/oneapi-src/unified-runtime.git")
-  # commit: 7c8617b3710736db642585fe310a64e19e059d2e
-  # Merge:  20d4f49  9a13af
+  # commit 036b9cfcd8fb4be9394449b5406e6402580a63c9
+  # Merge: 2ab0734 86f96f0
   # Author: Kenneth Benzie (Benie) <k.benzie@codeplay.com>
-  # Date:   Thu Oct 26 10:20:03 2023 +0100
-  #         Merge pull request #965 from Bensuo/ewan/L0_internal_event_fix
-  #         [Command-buffer][L0] Reset sync-point events
-  set(UNIFIED_RUNTIME_TAG 7c8617b3710736db642585fe310a64e19e059d2e)
+  # Date:   Fri Oct 27 16:36:23 2023 +0100
+  #     Merge pull request #961 from hdelan/change-unions-to-stdvariant
+  #     [HIP][CUDA] Change unions in ur_mem_handle_t_ to stdvariant
+  set(UNIFIED_RUNTIME_TAG 036b9cfcd8fb4be9394449b5406e6402580a63c9)
 
   if(SYCL_PI_UR_OVERRIDE_FETCH_CONTENT_REPO)
     set(UNIFIED_RUNTIME_REPO "${SYCL_PI_UR_OVERRIDE_FETCH_CONTENT_REPO}")