chore(main): release 1.12.0 #1499

Job	Run time
javadoc-with-doclet (java-bigtable)	1m 25s
build (8, java-bigquery, test)	2m 41s
javadoc-with-doclet (java-bigquery)	1m 22s
build (8, java-bigquery, lint)	1m 20s
javadoc-with-doclet (java-storage)	1m 24s
build (8, java-bigquery, clirr)	54s
javadoc-with-doclet (java-storage-nio)	1m 17s
build (8, java-bigquery, javadoc)	1m 27s
javadoc-with-doclet (java-spanner)	1m 43s
build (8, java-bigquery, javadoc-with-doclet)	1m 12s
javadoc-with-doclet (java-spanner-jdbc)	1m 10s
build (8, java-bigtable, test)	2m 56s
javadoc-with-doclet (java-pubsub)	1m 26s
build (8, java-bigtable, lint)	1m 25s
javadoc-with-doclet (java-pubsublite)	1m 36s
build (8, java-bigtable, clirr)	1m 22s
javadoc-with-doclet (java-logging)	1m 2s
javadoc-with-doclet (java-logging-logback)	59s
build (8, java-bigtable, javadoc)	2m 17s
build (8, java-bigtable, javadoc-with-doclet)	1m 10s
javadoc-with-doclet (java-firestore)	1m 35s
javadoc-with-doclet (java-datastore)	1m 52s
build (11, java-bigquery, test)	2m 39s
build (11, java-bigquery, lint)	1m 3s
javadoc-with-doclet (java-bigquerystorage)	1m 27s
build (11, java-bigquery, clirr)	1m 13s
build (11, java-bigquery, javadoc)	1m 40s
build (11, java-bigquery, javadoc-with-doclet)	1m 24s
build (11, java-bigtable, test)	3m 20s
build (11, java-bigtable, lint)	1m 42s
build (11, java-bigtable, clirr)	1m 32s
build (11, java-bigtable, javadoc)	2m 48s
build (11, java-bigtable, javadoc-with-doclet)	1m 28s
	53m 51s

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