Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /receiver/splunkhecreceiver #1298

Job	Run time
setup-environment	8m 6s
check-collector-module-version	8s
unittest (1.18)	1m 45s
unittest (1.17)	1m 49s
build-examples	57s
checks	2m 1s
correctness-metrics	2m 0s
correctness-traces	2m 3s
integration-tests	9m 25s
lint	1m 51s
cross-compile	0s
build-package	0s
windows-msi	0s
publish-check	0s
publish-stable	0s
publish-dev	0s
	30m 5s

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