Bump version to 16.0 (#928) #3577

Job	Run time
build (production)	1m 9s
build (test)	1m 16s
End to End testing (3.2)	2m 17s
test (3.2)	7m 22s
Elastic Search integration testing (3.2, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	3m 32s
test (.ruby-version)	8m 3s
End to End testing (.ruby-version)	2m 22s
Elastic Search integration testing (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:...	3m 13s
Libvips tests (3.2)	2m 51s
Elastic Search integration testing (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:...	3m 28s
Back to original and return test (.ruby-version)	10m 34s
Libvips tests (.ruby-version)	1m 51s
Elastic Search integration testing (.ruby-version, opensearchproject/opensearch:2)	3m 27s
	51m 25s

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