[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 Job ID Name Coverage
  Build
passed #225833
docker
build_linux_37

00:03:20

passed #225834
docker
build_linux_38

00:03:17

passed #225831
intel macos
build_macos_intel_37

00:06:25

passed #225832
intel macos
build_macos_intel_38

00:06:03