[tests][xarray] relax the test so it doesn't fail often

4 jobs for new-db in 6 minutes and 27 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_37 #225833
docker

00:03:20

passed build_linux_38 #225834
docker

00:03:17

passed build_macos_intel_37 #225831
macos intel

00:06:25

passed build_macos_intel_38 #225832
macos intel

00:06:03