Bump go.opentelemetry.io/collector/semconv from 0.51.0 to 0.91.0 in /exporter/splunkhecexporter #8912

Job	Run time
setup-environment	9m 39s
checks	34s
correctness-metrics	2m 3s
build-examples	1m 14s
check-collector-module-version	7s
correctness-traces	2m 45s
integration-tests	3m 6s
lint-matrix (receiver-0)	40s
unittest-matrix (1.18, receiver-0)	53s
lint-matrix (receiver-1)	42s
unittest-matrix (1.18, receiver-1)	56s
lint-matrix (processor)	41s
unittest-matrix (1.18, processor)	55s
lint-matrix (exporter)	42s
unittest-matrix (1.18, exporter)	56s
lint-matrix (extension)	42s
unittest-matrix (1.18, extension)	55s
unittest-matrix (1.18, internal)	58s
lint-matrix (internal)	46s
unittest-matrix (1.18, other)	39s
lint-matrix (other)	40s
unittest-matrix (1.17, receiver-0)	56s
unittest-matrix (1.17, receiver-1)	55s
unittest-matrix (1.17, processor)	57s
unittest-matrix (1.17, exporter)	58s
unittest-matrix (1.17, extension)	57s
unittest-matrix (1.17, internal)	57s
unittest-matrix (1.17, other)	41s
lint	0s
unittest	0s
cross-compile	0s
build-package	0s
windows-msi	0s
publish-dev	0s
publish-check	0s
publish-stable	0s
	36m 54s

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