update version bump script to consider level 3 (#6254)

theme-utils.mjs

@@ -728,7 +728,7 @@ async function versionBumpTheme(theme, addChanges) {
 	let styleCss = fs.readFileSync(`${theme}/style.css`, 'utf8');
 	let currentVersion = getThemeMetadata(styleCss, 'Version');
 
-	let filesToUpdate = await executeCommand(`find ${theme} -name package.json -o -name style.scss -o -name style-child-theme.scss -maxdepth 2`);
+	let filesToUpdate = await executeCommand(`find ${theme} -name package.json -o -name style.scss -o -name style-child-theme.scss -maxdepth 3`);
 	filesToUpdate = filesToUpdate.split('\n').filter(item => item != '');
 
 	for (let file of filesToUpdate) {