When upgrading, we should also update the Gradle plugin's compatibility testing so that the tests continue to cover the version of Gradle that we're using at the moment (6.7.1).
Comment From: wilkinsona
Upgrading to 6.8 fails due to this regression in Gradle. We could avoid the problem by writing out the file with malformed unicode content rather than storing it in src/test/resources but I'd prefer to wait for a fix on the Gradle side instead.