chore(deps): update metallb docker tag to v6.4.3

This MR contains the following updates:

Package	Update	Change
metallb (source)	patch	6.4.2 -> 6.4.3

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Release Notes

bitnami/charts (metallb)

v6.4.3

• [bitnami/metallb] Release 6.4.3 (#​31431)

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This MR has been generated by Renovate Bot.

enabled an automatic merge when all merge checks for 762ecacf pass

mentioned in issue #1188

merged

mentioned in commit 1d32ca3f