Fix Release NightlySnapshot workflow

[Amar3tto]

Fixes #38899
Successful run: https://github.com/apache/beam/actions/runs/34892083713

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[Abacn]

We still need to retain Java11 compatibility for pipeline execution. What change caused it's failing?

[Abacn]

org/codehaus/plexus/util/xml/pull/XmlPullParserException has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0

I see, it's #39857. Opened #40131

[damccorm]

Thanks, this is a good catch - I got my versions mixed up :)