Update Helm release metallb to v0.15.3 (main)

This MR contains the following updates:

Package	Update	Change
metallb (source)	patch	0.15.2 -> 0.15.3

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Release Notes

metallb/metallb (metallb)

v0.15.3

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See the release notes for the details:

https://metallb.universe.tf/release-notes/#version-0-15-3

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Configuration

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Closes #3304 (closed)