Don't upload test artifacts

Merge pull request http4s#7006 from http4s/pr/0.23.19-RC2

Release v0.23.19-RC2

Merge pull request http4s#6986 from http4s/pr/0.23.19-RC1

Release v0.23.19-RC1

Merge pull request http4s#6940 from http4s/1.0.0-M39

Release v1.0.0-M39

Merge pull request http4s#6926 from http4s/0.23.18

Release v0.23.18

Release v1.0.0-M38

Release v0.23.17

Release v0.22.15

Release v0.21.34

Merge pull request http4s#6697 from http4s/pr/release-1.0.0-M37

Release v1.0.0-M37