Linter: apply all recommended biome settings

Enforces previously-skipped useArrowFunction check

lib/operation.js

@@ -742,9 +742,7 @@ function convolve (kernel) {
   }
   // Default scale is sum of kernel values
   if (!is.integer(kernel.scale)) {
-    kernel.scale = kernel.kernel.reduce(function (a, b) {
-      return a + b;
-    }, 0);
+    kernel.scale = kernel.kernel.reduce((a, b) => a + b, 0);
   }
   // Clip scale to a minimum value of 1
   if (kernel.scale < 1) {
@@ -989,7 +987,7 @@ function modulate (options) {
  * @module Sharp
  * @private
  */
-module.exports = function (Sharp) {
+module.exports = (Sharp) => {
   Object.assign(Sharp.prototype, {
     autoOrient,
     rotate,