Release v0.6.0

What's Changed

• Bump docker/build-push-action from 3 to 4 by @dependabot in #19
• Bump ubuntu from 22.04 to 23.04 by @dependabot in #20

Full Changelog: v0.5.10...v0.6.0

Basic container:
ghcr.io/dergeberl/multitoolv0.6.0
dergeberl/multitool:v0.6.0

Network container:
ghcr.io/dergeberl/multitool-net:v0.6.0
dergeberl/multitool-net:v0.6.0

Kubectl container
ghcr.io/dergeberl/multitool-kubectl:v0.6.0
dergeberl/multitool-kubectl:v0.6.0