Revert "feat(Osv): Also pass the PURL if known"

This reverts commit 444a035 because some PURLs cause a bad request (HTTP
code 400) with OSV. Fixes #7239.

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

advisor/src/main/kotlin/advisors/Osv.kt

@@ -156,8 +156,7 @@ private fun createRequest(pkg: Package): VulnerabilitiesForPackageRequest? {
         return VulnerabilitiesForPackageRequest(
             pkg = org.ossreviewtoolkit.clients.osv.Package(
                 name = name,
-                ecosystem = ecosystem,
-                purl = pkg.purl.takeUnless { it.isEmpty() }
+                ecosystem = ecosystem
             ),
             version = pkg.id.version
         )