Bump go.uber.org/zap from 1.21.0 to 1.26.0 in /processor/groupbyattrsprocessor #1296

Job	Run time
setup-environment	13m 29s
checks	1m 18s
check-collector-module-version	8s
lint	1m 16s
unittest (1.18)	1m 19s
integration-tests	8m 25s
unittest (1.17)	1m 3s
build-examples	1m 2s
correctness-metrics	4m 6s
correctness-traces	3m 55s
cross-compile	0s
build-package	0s
windows-msi	0s
publish-stable	0s
publish-dev	0s
publish-check	0s
	36m 1s

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