promote @AndreMouche to sig-scheduling active contributor

[rleungx]

@AndreMouche has been actively contributed to PD recently. Here is a list of PR she has been worked with:

https://github.com/tikv/pd/pulls?q=is%3Apr+sort%3Aupdated-desc+author%3AAndreMouche+is%3Amerged

• *:process approximate rows in region pd#1104
• region: use ApproximateKeys instead of ApproximateRows pd#1144
• update CHANGELOG for v3.0.4 pd#1786
• .github/*: refine templates for pull request pd#2265
• server/scheduler: Do not remove the down peer until the normal peers are enough pd#3335
• server/api:support offline a store with physically destroyed  pd#3388
• api/store:set state do not support set from or to Tombstone anymore pd#3407
• client/base_client: do tiny refator for the function getMembers pd#3777

Therefore, I would like to promote @AndreMouche as an active contributor.

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SIG membership file format check passed. The SIG information will be updated when the PR is merged.

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