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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This MR has been generated by Renovate Bot.

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

added 1 commit

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

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changed the description

changed the description

added 63 commits

• 840a035d...cb907c40 - 62 commits from branch master
• c0a38348 - Update matthiasluedtke/iconserver Docker tag to v3.21.0

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