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/api/handlers/compat/containers_export.go

@@ -2,7 +2,6 @@ package compat
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 
@@ -19,7 +18,7 @@ func ExportContainer(w http.ResponseWriter, r *http.Request) {
 		utils.ContainerNotFound(w, name, err)
 		return
 	}
-	tmpfile, err := ioutil.TempFile("", "api.tar")
+	tmpfile, err := os.CreateTemp("", "api.tar")
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to create tempfile: %w", err))
 		return