chore(main): release 1.12.1 #1514

Job	Run time
build (8, java-bigquery, test)	2m 58s
javadoc-with-doclet (java-bigtable)	1m 34s
build (8, java-bigquery, lint)	1m 4s
javadoc-with-doclet (java-bigquery)	1m 8s
build (8, java-bigquery, clirr)	56s
javadoc-with-doclet (java-storage)	1m 32s
build (8, java-bigquery, javadoc)	1m 24s
javadoc-with-doclet (java-storage-nio)	58s
build (8, java-bigquery, javadoc-with-doclet)	50s
javadoc-with-doclet (java-spanner)	1m 34s
build (8, java-bigtable, test)	2m 52s
javadoc-with-doclet (java-spanner-jdbc)	1m 1s
build (8, java-bigtable, lint)	1m 15s
javadoc-with-doclet (java-pubsub)	1m 17s
build (8, java-bigtable, clirr)	1m 16s
javadoc-with-doclet (java-pubsublite)	1m 18s
build (8, java-bigtable, javadoc)	3m 12s
javadoc-with-doclet (java-logging)	1m 7s
build (8, java-bigtable, javadoc-with-doclet)	1m 7s
javadoc-with-doclet (java-logging-logback)	1m 17s
build (11, java-bigquery, test)	2m 42s
javadoc-with-doclet (java-firestore)	1m 41s
build (11, java-bigquery, lint)	1m 4s
javadoc-with-doclet (java-datastore)	1m 38s
build (11, java-bigquery, clirr)	1m 7s
javadoc-with-doclet (java-bigquerystorage)	1m 11s
build (11, java-bigquery, javadoc)	1m 15s
build (11, java-bigquery, javadoc-with-doclet)	1m 14s
build (11, java-bigtable, test)	3m 31s
build (11, java-bigtable, lint)	1m 41s
build (11, java-bigtable, clirr)	1m 28s
build (11, java-bigtable, javadoc)	2m 52s
build (11, java-bigtable, javadoc-with-doclet)	1m 13s
	52m 17s

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