chore: delete gax-httpjson reference in Release Please key #17355

Job	Run time
gapic-bom	1m 43s
package_name_check	1m 3s
root-pom	1m 44s
gitignore_correctness	1m 3s
group_id_check_for_maps_libraries	8m 11s
owlbot-yaml	1m 2s
owlbot-py	1m 12s
generate-readme	1m 3s
generate-readme	1m 6s
group_id_check_for_maps_libraries	8m 11s
owlbot-yaml	1m 2s
package_name_check	1m 3s
gitignore_correctness	1m 3s
owlbot-py	1m 12s
gapic-bom	1m 43s
root-pom	1m 44s
	34m 5s

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