Update sig-scale charter

[rthallisey]

What this PR does / why we need it: Update Sig-Scale charter

NONE

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[fabiand]

Is an update ot https://github.com/kubevirt/community/blob/main/sigs.yaml needed?

[fabiand]

@rthallisey how can we conervege aka merge tihs?

[rthallisey]

@fabiand yes, added.

[alaypatel07]

/lgtm

[aburdenthehand]

/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aburdenthehand

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