chore(deps): update node.js to v21.6 (#1062)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2.1
 executors:
   node:
     docker:
-      - image: cimg/node:21.5-browsers
+      - image: cimg/node:21.6-browsers
     working_directory: ~/repo
     environment:
       GIT_AUTHOR_EMAIL: [email protected]