Fix ninja issue with cppcheck and gh annotations

Author: pfultz2

share/rocmcmakebuildtools/cmake/ROCMCppCheck.cmake

@@ -118,7 +118,7 @@ macro(rocm_enable_cppcheck)
             # cmake-lint: disable=C0301
             set(CPPCHECK_TEMPLATE_ARG
                 "--template=::warning file={file},line={line},col={column}::{severity}: {inconclusive:inconclusive: }{message} [{id}]"
-                "--template-location={file}:{line}:{column}: note: {info}\\\n{code}")
+                "--template-location={file}:{line}:{column}: note: {info}\\n{code}")
         endif()
 
         set(CPPCHECK_COMMAND