Update code.cloudfoundry.org/guardian digest to 31ee14e

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
code.cloudfoundry.org/guardian	require	digest	6f75b11 → 31ee14e

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

go: errors parsing go.mod:
go.mod:10:2: require code.cloudfoundry.org/guardian: version "31ee14e06085" invalid: unknown revision 31ee14e06085