Upgrade maven-enforcer-plugin 3.0.0-M3 -> 3.4.1

[Picnic-Bot]

This PR contains the following updates:

Package	Type	Update	Change
maven-enforcer-plugin	build	minor	3.0.0-M3 -> 3.4.1

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[Picnic-Bot]

Suggested commit message:

Upgrade maven-enforcer-plugin 3.0.0-M3 -> 3.4.1

See:
- https://github.com/apache/maven-enforcer/releases/tag/enforcer-3.1.0
- https://github.com/apache/maven-enforcer/releases/tag/enforcer-3.2.1
- https://github.com/apache/maven-enforcer/releases/tag/enforcer-3.3.0
- https://github.com/apache/maven-enforcer/releases/tag/enforcer-3.4.0
- https://github.com/apache/maven-enforcer/releases/tag/enforcer-3.4.1
- https://github.com/apache/maven-enforcer/compare/enforcer-3.0.0...enforcer-3.4.1

[Picnic-Bot]

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