chore: add concurrently explicitly as a devDependency

it seems the inspector uses it, so npm i -D didn't add it in the
package.json. Now we mark it explicit.

Author: kmruiz

package.json

@@ -75,6 +75,7 @@
     "@typescript-eslint/parser": "^8.44.0",
     "@vitest/coverage-v8": "^3.2.4",
     "@vitest/eslint-plugin": "^1.3.4",
+    "concurrently": "^9.2.1",
     "duplexpair": "^1.0.2",
     "eslint": "^9.34.0",
     "eslint-config-prettier": "^10.1.8",