Update goacme/lego Docker tag to v4.28.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
goacme/lego	stage	minor	v4.25.2 -> v4.28.0

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Release Notes

go-acme/lego (goacme/lego)

v4.28.0

Compare Source

• Release date: 2025-10-31
• Tag: v4.28.0

Added

• [dnsprovider] Add DNS provider for Anexia
• [dnsprovider] Add DNS provider for webnames.ca
• [dnsprovider] webnames: rename to webnamesru to avoid ambiguity with webnamesca

Changed

• [dnsprovider,log] hetzner: add deprecation logs
• [dnsprovider] iwantmyname: provider deprecation
• [cli] improve retryable HTTP client error handling

Fixed

• [dnsprovider] hostinger: fix record update

v4.27.0

Compare Source

• Release date: 2025-10-17
• Tag: v4.27.0

Added

• [dnsprovider] Add DNS provider for Octenium
• [dnsprovider] Add DNS provider for Hostinger
• [dnsprovider] Add DNS provider for Beget.com

Changed

• [cli] support --private-key with a PKCS#8 keypair
• [dnsprovider] hetzner: update to new API
• [dnsprovider] otc: adds option to use private zone

Fixed

• [lib] fix: deduplicate order identifiers

v4.26.0

Compare Source

• Release date: 2025-09-13
• Tag: v4.26.0

Added

• [dnsprovider] Add DNS provider for KeyHelp
• [dnsprovider] Add DNS provider for Binary Lane
• [dnsprovider] Add DNS provider for Tencent EdgeOne
• [dnsprovider] azuredns: pipeline credential support
• [dnsprovider] oraclecloud: handle instance_principal authentication

Changed

• [dnsprovider] oraclecloud: add env var aliases
• [dnsprovider] simply: update to API v2
• [lib,cli] EAB: fallback to base64.URLEncoding

Fixed

• [dnsprovider] selectelv2: add missing options

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