release: Update package.xml version to 4.0.4

7 jobs for v4.0.4 in 6 minutes (queued for 7 seconds)
latest
Status Name Job ID Coverage
  Test
passed doc-coverage #126485

00:02:18

66.0%
passed format #126486

00:00:16

passed robotpkg-py-dynamic-graph-v3-18.04 #126480

00:03:00

passed robotpkg-py-dynamic-graph-v3-20.04 #126481

00:05:51

passed robotpkg-py-dynamic-graph-v3-buster #126482

00:03:11

passed robotpkg-py-dynamic-graph-v3-ferrum #126483

00:03:53

passed robotpkg-py-dynamic-graph-v3-stretch #126484

00:03:31