Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /extension/httpforwarder #1432

Job	Run time
setup-environment	15m 13s
stability-test (TestStabilityMetricsOTLP)	1m 7s
stability-test (TestStabilityMetricsOpenCensus)	1m 0s
stability-test (TestStabilityMetricsCarbon)	1m 6s
stability-test (TestStabilityMetricsSignalFx)	1m 25s
stability-test (TestStabilityTracesOpenCensus)	1m 2s
stability-test (TestStabilityTracesSAPM)	1m 11s
stability-test (TestStabilityTracesOTLP)	55s
stability-test (TestStabilityTracesJaegerGRPC)	50s
stability-test (TestStabilityTracesZipkin)	53s
	24m 42s

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