RFR: 7509: Add 2021-09 target platform [v2]

[Brice Dutheil]

On Fri, 14 Jan 2022 13:40:57 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> ...also updating babel.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed version

Marked as reviewed by bric3 at github.com (no known OpenJDK username).

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PR: https://git.openjdk.java.net/jmc/pull/357