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Trying to upgrade Gradle to 7.6 improved the checkstyle plugin such that it appears to have been running in new occasions. That in turn exposed us to checkstyle/checkstyle#5088. That bug was fixed in 8.28, which also fixed lots of other bugs. So now we have better checking and some existing volations needed fixing. Since the code style fixes generated a lot of noise, this is a pre-fix to reduce the size of a Gradle upgrade.
I did not upgrade past 8.28 because at some point some other bugs were introduced, in particular with the Indentation module. I chose the oldest version that had the particular bug impacting me fixed. Upgrading to this old-but-newer version still makes it easier to upgrade to a newer version in the future.