chore(deps): update external-dns docker tag to v8.3.12

[plural-copilot]

This PR contains the following updates:

Package	Update	Change
external-dns (source)	patch	8.3.8 -> 8.3.12

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Release Notes

bitnami/charts (external-dns)

v8.3.12

• [bitnami/external-dns] Allow rfc2136-zone to specify multiple zones (#​28681) (0868c63), closes #​28681

v8.3.11

• [bitnami/*] Remove wrong comment about imagePullPolicy (#​30107) (a51f9e4), closes #​30107
• [bitnami/external-dns] fix: secret not getting created when pihole password value is set (#​30114) (15c8fa0), closes #​30114

v8.3.10

• [bitnami/external-dns] chore: 🔧 👷 Re-enable CRD automation (#​29266) (9e50d55), closes #​29266
• Update documentation links to techdocs.broadcom.com (#​29931) (f0d9ad7), closes #​29931

v8.3.9

• [bitnami/external-dns] Release 8.3.9 (#​29690) (c30d45e), closes #​29690

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