Bump next from 12.3.1 to 15.1.6 in /website #583

Job	Run time
Setup	7s
noop	1s
check-generated-protobuf	1s
lint-enums	1s
check-generated-deep-copy	1s
lint-consul-retry	1s
lint-container-test-deps	1s
check-go-mod / check-go-mod	1s
lint / lint	1s
lint / lint api	1s
lint / lint sdk	1s
dev-build / build	1s
lint / lint envoyextensions	1s
lint / lint troubleshoot	1s
lint / lint test/integration/consul-container	1s
lint-32bit / lint	1s
lint-32bit / lint api	1s
lint-32bit / lint sdk	1s
lint-32bit / lint envoyextensions	1s
lint-32bit / lint troubleshoot	1s
lint-32bit / lint test/integration/consul-container	1s
go-test-oss	0s
go-test-enterprise	0s
go-test-race	0s
go-test-envoyextensions	0s
go-test-32bit	0s
go-test-troubleshoot	0s
go-test-api-1-19	0s
go-test-api-1-20	0s
go-test-sdk-1-19	0s
go-test-sdk-1-20	0s
go-tests-success	1s
	28s

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