Bump cpp-linter/cpp-linter-action from 2.14.0 to 2.15.0 #131

Job	Run time
build (ubuntu-latest, linux, 5.15, qtx11extras icu)	3m 14s
build (macos-13, mac, 6.8, qtmacextras)	2m 55s
build (ubuntu-latest, linux, 6.8)	2m 56s
	9m 5s

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