fix: procstat tags were not getting generated correctly (#9973)

Fixes: #9961

plugins/inputs/procstat/procstat.go

@@ -154,13 +154,18 @@ func (p *Procstat) Gather(acc telegraf.Accumulator) error {
 		}
 	}
 
-	tags := make(map[string]string)
 	p.procs = newProcs
 	for _, proc := range p.procs {
-		tags = proc.Tags()
 		p.addMetric(proc, acc, now)
 	}
 
+	tags := make(map[string]string)
+	for _, pidTag := range pidTags {
+		for key, value := range pidTag.Tags {
+			tags[key] = value
+		}
+	}
+
 	fields := map[string]interface{}{
 		"pid_count":   pidCount,
 		"running":     len(p.procs),