Fix handling of Stringable objects in JSON update requests #2302

Job	Run time
PHP 8, Solr 7 cloud	2m 32s
PHP 8, Solr 7 server	1m 34s
PHP 8, Solr 8 cloud	5m 54s
PHP 8, Solr 8 server	4m 39s
PHP 8, Solr 9 cloud	5m 46s
PHP 8, Solr 9 server	4m 45s
PHP 8.1, Solr 7 cloud	2m 37s
PHP 8.1, Solr 7 server	1m 33s
PHP 8.1, Solr 8 cloud	5m 42s
PHP 8.1, Solr 8 server	4m 35s
PHP 8.1, Solr 9 cloud	5m 32s
PHP 8.1, Solr 9 server	4m 49s
PHP 8.2, Solr 7 cloud	2m 36s
PHP 8.2, Solr 7 server	1m 39s
PHP 8.2, Solr 8 cloud	5m 36s
PHP 8.2, Solr 8 server	4m 40s
PHP 8.2, Solr 9 cloud	5m 37s
PHP 8.2, Solr 9 server	4m 50s
PHP 8.3, Solr 7 cloud	2m 27s
PHP 8.3, Solr 7 server	1m 33s
PHP 8.3, Solr 8 cloud	4m 10s
PHP 8.3, Solr 8 server	3m 2s
PHP 8.3, Solr 9 cloud	4m 10s
PHP 8.3, Solr 9 server	3m 11s
Upload coverage to codecov.io	6s
	1h 33m 35s

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