Stop using deprecated ioutil functions

api/loader/fileloader.go

@@ -5,7 +5,7 @@ package loader
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/url"
@@ -302,7 +302,7 @@ func (fl *fileLoader) Load(path string) ([]byte, error) {
 			}
 			return nil, fmt.Errorf("%w: status code %d (%s)", ErrHTTP, resp.StatusCode, http.StatusText(resp.StatusCode))
 		}
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return nil, err
 		}

api/loader/fileloader_test.go

@@ -5,7 +5,7 @@ package loader
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"path"
@@ -518,7 +518,7 @@ func TestLoaderHTTP(t *testing.T) {
 			require.Equal(x.path, u)
 			return &http.Response{
 				StatusCode: 200,
-				Body:       ioutil.NopCloser(bytes.NewBufferString(x.expectedContent)),
+				Body:       io.NopCloser(bytes.NewBufferString(x.expectedContent)),
 				Header:     make(http.Header),
 			}
 		})