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)