Incremented __SYCL_COMPILER_2023_SWITRCHOVER macro

Intel(R) oneAPI DPC++ 2022.2.1 was released with __SYCL_COMPILER_VERSION
variable at 20221020L.

Adjustment of the SWiTCHOVER variables allows for `dpctl` to compile
with that compiler.

Author: oleksandr-pavlyk

libsyclinterface/include/Config/dpctl_config.h.in

@@ -30,11 +30,12 @@
     @DPCTL_ENABLE_L0_PROGRAM_CREATION@
 
 /* Version of SYCL DPC++ 2023 compiler at which transition to SYCL 2020 occurs */
-#define __SYCL_COMPILER_2023_SWITCHOVER 20221020L
+/* Intel(R) oneAPI DPC++ 2022.2.1 compiler has version 20221020L */
+#define __SYCL_COMPILER_2023_SWITCHOVER 20221021L
 
 /* Version of SYCL DPC++ compiler at which info::max_work_item_size was
    made templated */
-#define __SYCL_COMPILER_MAX_WORK_ITEM_SIZE_THRESHOLD 20220805L
+#define __SYCL_COMPILER_MAX_WORK_ITEM_SIZE_THRESHOLD __SYCL_COMPILER_2023_SWITCHOVER
 
 /* The DPCPP version used to build dpctl */
 #define DPCTL_DPCPP_VERSION "@IntelSycl_VERSION@"