Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /extension/observer/ecsobserver #1346

Job	Run time
setup-environment	8m 50s
stability-test (TestStabilityMetricsOTLP)	48s
stability-test (TestStabilityMetricsOpenCensus)	1m 1s
stability-test (TestStabilityMetricsCarbon)	51s
stability-test (TestStabilityMetricsSignalFx)	49s
stability-test (TestStabilityTracesOpenCensus)	1m 12s
stability-test (TestStabilityTracesSAPM)	1m 10s
stability-test (TestStabilityTracesOTLP)	52s
stability-test (TestStabilityTracesJaegerGRPC)	51s
stability-test (TestStabilityTracesZipkin)	1m 9s
	17m 33s

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