[UR] Use reference counting on factories

Pre-commit MR for oneapi-src/unified-runtime#2048

Author: RossBrunton

sycl/cmake/modules/UnifiedRuntimeTag.cmake

@@ -1,7 +1,6 @@
-# commit aa72577da55571b15028dd1710e02a7ea4f62338
-# Merge: 89def64486dd 3d2b7210e352
-# Author: Martin Grant <martin.morrisongrant@codeplay.com>
-# Date:   Fri Dec 6 15:24:04 2024 +0000
-#     Merge pull request #2352 from aarongreig/aaron/fixCoverity15-11
-#     Fix a number of issues from the latest coverity scan.
-set(UNIFIED_RUNTIME_TAG aa72577da55571b15028dd1710e02a7ea4f62338)
+set(UNIFIED_RUNTIME_REPO "https://github.com/RossBrunton/unified-runtime.git")
+# commit put-commit-here
+# Author: Ross Brunton <ross@codeplay.com>
+# Date:   Wed Sep 4 17:25:11 2024 +0100
+# Use reference counting on factories
+set(UNIFIED_RUNTIME_TAG 3a6ed49bd4d988618de1a30a7f461c6414f52b6b)