client: remove unused `requests.items.getEntries` method #852

Job	Run time
Check with PHP 8.3 and sqlite storage backend	1m 44s
Check with PHP 8.2 and sqlite storage backend	1m 55s
Check with PHP 8.1 and sqlite storage backend	1m 34s
Check with PHP 8.0 and sqlite storage backend	1m 35s
Check with PHP 7.4 and sqlite storage backend	1m 46s
Check with PHP 8.2 and mysql storage backend	1m 37s
Check with PHP 8.2 and postgresql storage backend	1m 37s
Upload artefacts	2m 0s
	13m 48s

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