Add changelog entry for post-processing change #6134

Job	Run time
Ruby analysis (ubuntu-latest, linked)	50s
Ruby analysis (ubuntu-latest, default)	3m 28s
Ruby analysis (macos-latest, nightly-latest)	57s
Ruby analysis (macos-latest, default)	53s
Ruby analysis (ubuntu-latest, nightly-latest)	53s
Ruby analysis (macos-latest, linked)	54s
	7m 55s

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