Update Helm release gateway to v1.18.2

This MR contains the following updates:

Package	Update	Change
gateway	patch	1.18.0-rc.0 -> 1.18.2

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⚠ Dependency Lookup Warnings ⚠

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Release Notes

istio/istio (gateway)

v1.18.2: Istio 1.18.2

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Artifacts Release Notes

v1.18.1: Istio 1.18.1

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Artifacts Release Notes

v1.18.0: Istio 1.18.0

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Artifacts Release Notes

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Configuration

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