Replace deprecated ioutil

Package `io/ioutil` was deprecated in golang 1.16, preventing podman from
building under Fedora 37.  Fortunately, functionality identical
replacements are provided by the packages `io` and `os`.  Replace all
usage of all `io/ioutil` symbols with appropriate substitutions
according to the golang docs.

Signed-off-by: Chris Evich <cevich@redhat.com>

pkg/machine/pull.go

@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	url2 "net/url"
 	"os"
@@ -191,7 +190,7 @@ func Decompress(localPath, uncompressedPath string) error {
 	if err != nil {
 		return err
 	}
-	sourceFile, err := ioutil.ReadFile(localPath)
+	sourceFile, err := os.ReadFile(localPath)
 	if err != nil {
 		return err
 	}