[SYCL] Bump sycl library minor version (#5919)

Increasing minor version of the DPCPP RT library as part of preparation
for April release. Changing minor version only as there were no
backward incompatible changes.

Author: romanovvlad

sycl/CMakeLists.txt

@@ -19,7 +19,7 @@ include(AddSYCLExecutable)
 include(SYCLUtils)
 
 set(SYCL_MAJOR_VERSION 5)
-set(SYCL_MINOR_VERSION 5)
+set(SYCL_MINOR_VERSION 6)
 set(SYCL_PATCH_VERSION 0)
 set(SYCL_DEV_ABI_VERSION 0)
 if (SYCL_ADD_DEV_VERSION_POSTFIX)