Update vXnat to v1.8.4

1 job for renovate/vxnat in 38 seconds (queued for 11 seconds)
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Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.9.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 18s
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1