Update Helm release base to v1.31.1

This MR contains the following updates:

Package	Update	Change
base	minor	1.30.4 → 1.31.1

Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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Reviewer only

• Tested and Validated changes

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Release Notes

istio/istio (base)

v1.31.1: Istio 1.31.1

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Artifacts Release Notes

v1.31.0: Istio 1.31.0

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Artifacts Release Notes

v1.30.5: Istio 1.30.5

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Artifacts Release Notes

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Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)

Closes #55 (closed)