Stop using checksum based artifactory deploys

[philwebb]

Checksum uploads cause confusion since often source jars haven't changed even though binary ones have. This means the artifact names in the maven-metadata looks weird.

See spring-io/artifactory-resource#2

[philwebb]

Interestingly this doesn't actually prevent the issue. It seems that it's the conversion from SNAPSHOT to the timestamp variant that finds the old file.

[philwebb]

Artifactory has a class called UniqueSnapshotVersionAdapter which includes this comment:

pom checksums and artifacts with classifier are always deployed after the pom (which triggers the maven-metadata.xml calculation) so use the metadata build number

Our current resource doesn't necessarily follow this logic so that could be something else to try.

See spring-io/artifactory-resource#3

[philwebb]

I'll leave this in for now since it really doesn't slow things down all that much.