fix(dis-pgsql-operator): remove unused armnetwork/v9 direct dependency

[bengtfredh]

Summary

Fixes the duplicate entry problem in PR #3577 (same pattern as #3579 for lakmus).

armnetwork/v9 v9.0.0 was added as a direct dependency but is never imported anywhere — only armnetwork/v7 is used in source. PR #3577 would replace the v7 line with v9 but since v9 is already present, it produces a duplicate.

PR #3577 should be closed.

Test plan

• Lint and Test on Ubuntu passes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: e55793ce-e497-4203-8cec-a5928013a765

📥 Commits

Reviewing files that changed from the base of the PR and between 7304975 and 4a87d26.

⛔ Files ignored due to path filters (1)

• services/dis-pgsql-operator/go.sum is excluded by !**/*.sum

📒 Files selected for processing (1)

• services/dis-pgsql-operator/go.mod

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pgsql-remove-duplicate-armnetwork

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