Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /extension/bearertokenauthextension #1419

Job	Run time
setup-environment	12m 31s
stability-test (TestStabilityMetricsOTLP)	1m 2s
stability-test (TestStabilityMetricsOpenCensus)	1m 31s
stability-test (TestStabilityMetricsCarbon)	1m 3s
stability-test (TestStabilityMetricsSignalFx)	46s
stability-test (TestStabilityTracesOpenCensus)	1m 36s
stability-test (TestStabilityTracesSAPM)	1m 2s
stability-test (TestStabilityTracesOTLP)	52s
stability-test (TestStabilityTracesJaegerGRPC)	44s
stability-test (TestStabilityTracesZipkin)	1m 0s
	22m 7s

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