Bump golang.org/x/net from 0.21.0 to 0.23.0 in /exporter/otlpexporter #15

Job	Run time
govulncheck	1m 4s
setup-environment	31s
checks	45s
lint	1m 49s
unittest-matrix (~1.22)	1m 30s
test-coverage	1m 41s
unittest-matrix (~1.21.5)	1m 40s
cross-build-collector (darwin, amd64)	21s
cross-build-collector (darwin, arm64)	16s
cross-build-collector (linux, 386)	8s
cross-build-collector (linux, amd64)	10s
cross-build-collector (linux, arm64)	10s
cross-build-collector (linux, ppc64le)	10s
cross-build-collector (linux, arm, 7)	11s
cross-build-collector (linux, s390x)	13s
cross-build-collector (windows, 386)	15s
cross-build-collector (windows, amd64)	13s
unittest	1s
	11m 8s

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