Update Envoy Gateway to v1.8.1

This MR contains the following updates:

Package	Update	Change
gateway-crds-helm	patch	1.8.0 -> 1.8.1
gateway-helm (source)	patch	1.8.0 -> 1.8.1

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Release Notes

envoyproxy/gateway (gateway-crds-helm)

v1.8.1

Compare Source

Release Announcement

Check out the v1.8.1 release announcement to learn more about the release.

What's Changed

• [release/v1.8] fix: add unary interceptor and fix fail-open auth in GatewayNamespaceMode (#​8986) by @​cnvergence in https://github.com/envoyproxy/gateway/pull/9118
• [release-1.8] bump envoy to 1.38.1 by @​zirain in https://github.com/envoyproxy/gateway/pull/9168
• [release/v1.8] cherry-pick for v1.8.1 by @​jukie in https://github.com/envoyproxy/gateway/pull/9169
• [release-1.8] fix github SA for June release by @​zirain in https://github.com/envoyproxy/gateway/pull/9172
• [release-1.8] cherry-pick release notes and version bump by @​jukie in https://github.com/envoyproxy/gateway/pull/9174

Full Changelog: https://github.com/envoyproxy/gateway/compare/v1.8.0...v1.8.1

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