New JDK 11u maintainer: Severin Gehwolf

[Andrew Haley]

An announcement: Severin Gehwolf is now a maintainer of JDK 11u. He
joins Christoph Langer in this role. I've been working with Severin
for a long while and I'm confident he'll make a good job of this.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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