slack-vitess-r14.0.5-dsdefense: use larger runner

[timvaillancourt]

Description

Use the new, paid vitess GitHub Actions "runner group" to improve CI stability

This is utilising a single 8xCPU/32GB/300GB SSD instance on Ubuntu 22:

And it's under the runner group vitess-ubuntu22:

p vitess-ubuntu22:

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on the CI
• Documentation was added or is not required

Deployment Notes

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