Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /exporter/azuremonitorexporter #1450

Job	Run time
setup-environment	13m 20s
stability-test (TestStabilityMetricsOTLP)	50s
stability-test (TestStabilityMetricsOpenCensus)	52s
stability-test (TestStabilityMetricsCarbon)	1m 28s
stability-test (TestStabilityMetricsSignalFx)	51s
stability-test (TestStabilityTracesOpenCensus)	1m 3s
stability-test (TestStabilityTracesSAPM)	1m 2s
stability-test (TestStabilityTracesOTLP)	1m 9s
stability-test (TestStabilityTracesJaegerGRPC)	1m 31s
stability-test (TestStabilityTracesZipkin)	1m 9s
	23m 15s

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