Add release note for 1.31.0 #11677

Job	Run time
site	6m 44s
flaky-tests	12m 21s
build-ubicloud-standard-8-jdk-21-snapshot-blockhound	23m 31s
lint	5m 11s
build-macos-12-jdk-21	1h 19m 9s
build-windows-latest-jdk-21	59m 13s
build-ubicloud-standard-8-jdk-8	14m 25s
build-ubicloud-standard-8-jdk-11	11m 5s
build-ubicloud-standard-8-jdk-17-leak	18m 27s
build-ubicloud-standard-8-jdk-17-min-java-11	18m 17s
build-ubicloud-standard-8-jdk-17-min-java-17-coverage	23m 2s
	4h 31m 25s

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