Bump golang.org/x/net from 0.20.0 to 0.23.0 in /extension/auth #6

Job	Run time
govulncheck	1m 2s
setup-environment	32s
checks	49s
cross-build-collector (darwin, amd64)	9s
cross-build-collector (darwin, arm64)	15s
lint	1m 44s
cross-build-collector (linux, 386)	15s
cross-build-collector (linux, amd64)	19s
cross-build-collector (linux, arm64)	10s
test-coverage	1m 42s
cross-build-collector (linux, ppc64le)	12s
cross-build-collector (linux, arm, 7)	13s
unittest-matrix (~1.22)	1m 35s
cross-build-collector (linux, s390x)	8s
unittest-matrix (~1.21.5)	1m 36s
cross-build-collector (windows, 386)	18s
cross-build-collector (windows, amd64)	10s
unittest	1s
	11m 10s

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