chore(deps): update helm release metallb to v6.3.15

This MR contains the following updates:

Package	Update	Change
metallb (source)	patch	6.3.13 -> 6.3.15

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Release Notes

bitnami/charts (metallb)

v6.3.15

• [bitnami/metallb] Unify seLinuxOptions default value (#​30339)

v6.3.14

• [bitnami/*] Remove wrong comment about imagePullPolicy (#​30107) (a51f9e4), closes #​30107
• [bitnami/metallb] Release 6.3.14 (#​30280) (7c02be0), closes #​30280
• Update documentation links to techdocs.broadcom.com (#​29931) (f0d9ad7), closes #​29931

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