Add missing `ZBytes::str` (#534) #3158

Job	Run time
Check zenoh-python using Rust 1.75	28s
check	1m 48s
markdown_lint	4s
build (3.9)	2m 50s
build (3.10)	2m 52s
build (3.12)	2m 58s
build (3.13-dev)	2m 54s
build (3.11)	2m 48s
CI status checks	3s
	16m 45s

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