feat: bump cert-manager to v1.12.3

[takirala]

What type of PR is this?

Needed for bumping cert-manager to v1.12.3 - See mesosphere/kommander-applications#1604

What this PR does/ why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Checklist

• If a chart is changed, the chart version is correctly incremented.
• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

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