client: remove unused `requests.items.getEntries` method #856

Job	Run time
Check with PHP 8.3 and sqlite storage backend	1m 46s
Check with PHP 8.2 and sqlite storage backend	1m 43s
Check with PHP 8.1 and sqlite storage backend	1m 56s
Check with PHP 8.0 and sqlite storage backend	1m 41s
Check with PHP 7.4 and sqlite storage backend	1m 59s
Check with PHP 8.2 and mysql storage backend	1m 34s
Check with PHP 8.2 and postgresql storage backend	1m 40s
Upload artefacts	5m 39s
	17m 58s

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