Bundled Themes: Twenty Twenty and Twenty Nineteen version bump.

We are releasing new versions of Twenty Twenty & Twenty Nineteen today thus we need to bump the version.

Props ianbelanger.
Fixes #50359.
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git-svn-id: https://core.svn.wordpress.org/trunk@47724 1a063a9b-81f0-0310-95a4-ce76da25c4cd