IWYU not in sync about ament_lint

[dirk-thomas]

It looks to me that our version of the file already contains the patch of the referenced PR:

ament_lint/ament_cpplint/ament_cpplint/cpplint.py

Lines 5512 to 5518 in d079913

	matched = pattern.search(line)
	if matched:
	# Don't warn about IWYU in non-STL namespaces:
	# (We check only the first match per line; good enough.)
	prefix = line[:matched.start()]
	if prefix.endswith('std::') or not prefix.endswith('::'):
	required[header] = (linenum, template)

[Karsten1987]

Must have overlooked that. Sorry for the noise then.
FWIW, the linter will complain every time you use the word 'string' as a variable name.