chore: use errors.New to replace fmt.Errorf with no parameters

x/blob/types/params.go

@@ -1,6 +1,7 @@
 package types
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/celestiaorg/celestia-app/v3/pkg/appconsts"
@@ -67,7 +68,7 @@ func validateGasPerBlobByte(v interface{}) error {
 	}
 
 	if gasPerBlobByte == 0 {
-		return fmt.Errorf("gas per blob byte cannot be 0")
+		return errors.New("gas per blob byte cannot be 0")
 	}
 
 	return nil
@@ -81,7 +82,7 @@ func validateGovMaxSquareSize(v interface{}) error {
 	}
 
 	if govMaxSquareSize == 0 {
-		return fmt.Errorf("gov max square size cannot be zero")
+		return errors.New("gov max square size cannot be zero")
 	}
 
 	if !square.IsPowerOfTwo(govMaxSquareSize) {

x/mint/types/minter.go

@@ -1,6 +1,7 @@
 package types
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
@@ -33,7 +34,7 @@ func (m Minter) Validate() error {
 		return fmt.Errorf("annual provisions %v should be positive", m.AnnualProvisions.String())
 	}
 	if m.BondDenom == "" {
-		return fmt.Errorf("bond denom should not be empty string")
+		return errors.New("bond denom should not be empty string")
 	}
 	return nil
 }