sysutils/k9s: Update to 0.50.3
Changelogs:
https://github.com/derailed/k9s/releases/tag/v0.50.0
https://github.com/derailed/k9s/releases/tag/v0.50.1
https://github.com/derailed/k9s/releases/tag/v0.50.2
https://github.com/derailed/k9s/releases/tag/v0.50.3
PR: 285996
Approved by: Robert Gogolok <gogolok@gmail.com> (maintainer)