cert-manager-app release v3.1.0

⚠️ Attention: Major release 3.0.0 contains breaking changes in user values! Please make yourself familiar with its changelog! ⚠️

Changed

• Update container image versions to use v1.12.3 (#344)
• Fix PodDisruptionBudget templates for simultaneous minAvailable and maxUnavailable null values. (#344)
• Make resource names less long through default values change. (#343)