Bump google.golang.org/protobuf from 1.28.0 to 1.36.1 in /exporter/splunkhecexporter #12259

Job	Run time
setup-environment	1m 52s
lint-matrix	0s
checks	0s
check-collector-module-version	0s
build-examples	0s
correctness-metrics	0s
correctness-traces	0s
integration-tests	0s
unittest-matrix	0s
lint	0s
unittest	0s
cross-compile	0s
build-package	0s
windows-msi	0s
publish-stable	0s
publish-dev	0s
publish-check	0s
	1m 52s

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