Update module sigs.k8s.io/gateway-api to v1.6.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sigs.k8s.io/gateway-api	v1.6.2 → v1.6.3

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Release Notes

kubernetes-sigs/gateway-api (sigs.k8s.io/gateway-api)

v1.6.3

Compare Source

v1.6.3

Major Changes Since v1.6.2

Conformance

• Conformance tests for stable features (notable TCPRoute and UDPRoute) are no longer marked as "provisional" (#​5260, @​rikatz)
• Force the timeout for the ExpectMirroredRequest conformance test to MaxTimeToConsistency (#​5296, @​kl52752)
• Actually remove unused namespaces in Mesh conformance tests (#​5251, @​xtineskim)
• Add the GatewayInvalidParametersRef conformance test (#​5236, @​kl52752)

Build

• Ensure the Go toolchain matches go.work (#​5234, @​snorwin)

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