Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /exporter/awscloudwatchlogsexporter #1310

Job	Run time
setup-environment	13m 48s
stability-test (TestStabilityMetricsOTLP)	53s
stability-test (TestStabilityMetricsOpenCensus)	42s
stability-test (TestStabilityMetricsCarbon)	1m 8s
stability-test (TestStabilityMetricsSignalFx)	1m 15s
stability-test (TestStabilityTracesOpenCensus)	51s
stability-test (TestStabilityTracesSAPM)	1m 12s
stability-test (TestStabilityTracesOTLP)	57s
stability-test (TestStabilityTracesJaegerGRPC)	1m 7s
stability-test (TestStabilityTracesZipkin)	1m 32s
	23m 25s

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