[Fortran/gfortran] Disable pr85313.f90

Same rationale as #286: Since https://github.com/llvm/llvm-project/pull/160283,
Flang checks for non-rectangular loop nests and correctly emits error
diagnostics for being unsupported. Hence, disable the tests that contain
non-rectangular loop nests.
diff --git a/Fortran/gfortran/regression/gomp/DisabledFiles.cmake b/Fortran/gfortran/regression/gomp/DisabledFiles.cmake
index 440ee9b..6bbb458 100644
--- a/Fortran/gfortran/regression/gomp/DisabledFiles.cmake
+++ b/Fortran/gfortran/regression/gomp/DisabledFiles.cmake
@@ -82,6 +82,7 @@
 
   # unimplemented: non-rectangular canonical loop nests
   canonical-loop-1.f90
+  pr85313.f90
 )
 
 file(GLOB SKIPPED_FILES CONFIGURE_DEPENDS