clang-tidy: exclude 'modernize-use-noexcept' introduced in 5.0.0

We still support compiling CMake on VS 2013 that does not support
`noexcept`, so disable the clang-tidy diagnostic for now.

.clang-tidy

@@ -16,6 +16,7 @@ modernize-*,\
 -modernize-use-emplace,\
 -modernize-use-equals-default,\
 -modernize-use-equals-delete,\
+-modernize-use-noexcept,\
 -modernize-use-transparent-functors,\
 -modernize-use-using,\
 performance-*,\