[milvus] bump attu version to v2.4.7

[shanghaikid]

What this PR does / why we need it:

Attu v2.4.7 was released with two security patches, the user is asking to bump the version here as well.

https://github.com/zilliztech/attu/issues/622

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [ ] Chart Version bumped
• [ ] Variables are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [mychartname])
• [x] PR only contains changes for one chart

[sre-ci-robot]

Welcome @shanghaikid! It looks like this is your first PR to zilliztech/milvus-helm 🎉

[haorenfsa]

/lgtm

[haorenfsa]

@shanghaikid chart version should also be bumped https://github.com/zilliztech/milvus-helm/blob/master/charts/milvus/Chart.yaml

[shanghaikid]

@shanghaikid chart version should also be bumped https://github.com/zilliztech/milvus-helm/blob/master/charts/milvus/Chart.yaml

done.

[haorenfsa]

/approve

[haorenfsa]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haorenfsa, shanghaikid

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