package.json: explicitly add the globals dev dependency

This is needed allow `npm run lint` to run again after the Jest version
bump switched us over to a flat ESLint configuration that assumes the
shared globals catalog is available. Without explicitly declaring that
package, `npm run lint` fails because Node cannot resolve the import
inside `eslint.config.mjs`.

Assisted-by: GPT-5-Codex
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

package-lock.json

@@ -45,6 +45,7 @@
     "eslint-plugin-github": "^5.1.8",
     "eslint-plugin-jest": "^29.0.1",
     "eslint-plugin-prettier": "^5.5.4",
+    "globals": "^15.8.0",
     "jest": "^30.2.0",
     "jest-circus": "^29.7.0",
     "js-yaml": "^4.1.0",