git: openjdk/jdk11u-dev: 8309108: Bump update version for OpenJDK: jdk-11.0.21

[Goetz Lindenmaier]

Changeset: b2faa356
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-05-30 16:40:22 +0000
URL:       https://git.openjdk.org/jdk11u-dev/commit/b2faa3567e3b934689845025333c41bcbfe18b1e

8309108: Bump update version for OpenJDK: jdk-11.0.21

Reviewed-by: mdoerr

! .jcheck/conf
! make/autoconf/version-numbers