Update dependency de.bsvrz.gradle.nerzswe:de.bsvrz.gradle.nerzswe.gradle.plugin to v0.21.0

This MR contains the following updates:

Package	Update	Change
de.bsvrz.gradle.nerzswe:de.bsvrz.gradle.nerzswe.gradle.plugin	minor	0.16.0 -> 0.21.0

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