Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /exporter/loadbalancingexporter #1408

Job	Run time
setup-environment	18m 11s
checks	16s
check-collector-module-version	7s
build-examples	57s
correctness-metrics	2m 43s
correctness-traces	4m 7s
integration-tests	7m 45s
lint	17s
unittest (1.18)	39s
unittest (1.17)	46s
cross-compile	0s
windows-msi	0s
build-package	0s
publish-check	0s
publish-dev	0s
publish-stable	0s
	35m 48s

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