Update matthiasluedtke/iconserver Docker tag to v3.21.0

This MR contains the following updates:

Package	Update	Change
matthiasluedtke/iconserver	minor	v3.16.0 -> v3.21.0

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mentioned in issue #40

changed title from Update matthiasluedtke/iconserver Docker tag to v3.20.0 to Update matthiasluedtke/iconserver Docker tag to v3.21.0

changed the description

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• 840a035d - Update matthiasluedtke/iconserver Docker tag to v3.21.0

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