chore(deps): update code.forgejo.org/forgejo/runner docker tag to v12.6.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
code.forgejo.org/forgejo/runner (source)	final	patch	12.6.3 → 12.6.4

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Release Notes

forgejo/runner (code.forgejo.org/forgejo/runner)

v12.6.4

Compare Source

• User guide
• Administrator guide
• Container images

Release Notes

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• bug fixes
  • PR: fix: respect "automount" docker setting in one-job
  • PR: fix: interpolate job name after matrix expansion
  • PR: fix: Isolate step containers network namespace to match docker:// action semantics
• other
  • PR: fix GetOutboundIp auto-detection on ipv6-only systems
  • PR: Alert users that defaults are used when --config is not provided.
  • PR: Update dependency go to v1.25.7
  • PR: Update dependency forgejo/release-notes-assistant to v1.5.2
  • PR: Update dependency forgejo-runner-service-yq to v4.52.2
  • PR: Update https://data.forgejo.org/actions/setup-forgejo action to v3.1.4
  • PR: Update data.forgejo.org/forgejo/runner Docker tag to v12.6.3
  • PR: Update dependency forgejo/runner to v12.6.3

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