maven jar return 'jar' as package type instead of 'maven'

name: perfmark-api-0.27.0
download_url: https://repo1.maven.org/maven2/io/perfmark/perfmark-api/0.27.0/perfmark-api-0.27.0.jar

SCIO returns `pkg:jar/io.perfmark@0.27.0` as the purl

Expected PURL: `pkg:maven/io.perfmark/perfmark-api@0.27.0`