refactor: stop using deprecated io/ioutil

node/modules/core.go

@@ -5,7 +5,6 @@ import (
 	"crypto/rand"
 	"errors"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -147,7 +146,7 @@ func APISecret(keystore types.KeyStore, lr repo.LockedRepo) (*dtypes.APIAlg, err
 	if errors.Is(err, types.ErrKeyInfoNotFound) {
 		log.Warn("Generating new API secret")
 
-		sk, err := ioutil.ReadAll(io.LimitReader(rand.Reader, 32))
+		sk, err := io.ReadAll(io.LimitReader(rand.Reader, 32))
 		if err != nil {
 			return nil, err
 		}

node/modules/testing/genesis.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
 	"github.com/ipfs/go-blockservice"
@@ -60,7 +59,7 @@ func MakeGenesis(outFile, genesisTemplate string) func(bs dtypes.ChainBlockstore
 				return nil, err
 			}
 
-			fdata, err := ioutil.ReadFile(genesisTemplate)
+			fdata, err := os.ReadFile(genesisTemplate)
 			if err != nil {
 				return nil, xerrors.Errorf("reading preseals json: %w", err)
 			}