Fix deprecated use of mountinfo.PidMountInfo (SA1019)

Signed-off-by: Jan Rodák <hony.com@seznam.cz>

pkg/mount/mountinfo_linux.go

@@ -1,5 +1,18 @@
 package mount
 
-import "github.com/moby/sys/mountinfo"
+import (
+	"fmt"
+	"os"
 
-var PidMountInfo = mountinfo.PidMountInfo
+	"github.com/moby/sys/mountinfo"
+)
+
+func PidMountInfo(pid int) ([]*Info, error) {
+	f, err := os.Open(fmt.Sprintf("/proc/%d/mountinfo", pid))
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return mountinfo.GetMountsFromReader(f, nil)
+}