git: openjdk/jdk11u-dev: 8303432: Bump update version for OpenJDK: jdk-11.0.20

[Goetz Lindenmaier]

Changeset: 0748e2ab
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-03-07 20:30:14 +0000
URL:       https://git.openjdk.org/jdk11u-dev/commit/0748e2abf322a0648c10a268d3d6198ddc24028d

8303432: Bump update version for OpenJDK: jdk-11.0.20

Reviewed-by: rrich

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