chore: fix some logging output (#3884)

Signed-off-by: Weston Steimel <author@code.w.steimel.me.uk>

syft/format/internal/backfill.go

@@ -23,7 +23,7 @@ func Backfill(p *pkg.Package) {
 
 	purl, err := packageurl.FromString(p.PURL)
 	if err != nil {
-		log.Debug("unable to parse purl: %s: %w", p.PURL, err)
+		log.Debugf("unable to parse purl: %s: %w", p.PURL, err)
 		return
 	}
 

syft/format/syftjson/model/package.go

@@ -59,7 +59,7 @@ func newModelLicensesFromValues(licenses []string) (ml []License) {
 	for _, v := range licenses {
 		expression, err := license.ParseExpression(v)
 		if err != nil {
-			log.Trace("could not find valid spdx expression for %s: %w", v, err)
+			log.Tracef("could not find valid spdx expression for %s: %w", v, err)
 		}
 		ml = append(ml, License{
 			Value:          v,