fix heapsize syntax

10 jobs for 4.x in 4 minutes and 47 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Publish
passed build-version #76593

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passed build-version-all #76601

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passed build-version-all-free #76602

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passed build-version-images #76598

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passed build-version-images-jp2 #76599

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passed build-version-images-jp2-free #76600

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passed build-version-jp2 #76595

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passed build-version-jp2-free #76596

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passed build-version-vanilla #76594

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passed build-version-video #76597

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