Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /tracegen #1417

Job	Run time
setup-environment	7m 16s
checks	19s
unittest (1.18)	24m 15s
unittest (1.17)	24m 7s
build-examples	4m 32s
correctness-traces	4m 9s
check-collector-module-version	8s
correctness-metrics	3m 11s
integration-tests	12m 40s
lint	28s
cross-compile	0s
windows-msi	0s
build-package	0s
publish-dev	0s
publish-check	0s
publish-stable	0s
	1h 21m 5s

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