chore(deps): update circleci/node docker tag to v16

Signed-off-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
   build:
     working_directory: ~/rollup-plugin-just-gzip
     docker:
-      - image: circleci/node:8@sha256:cf63f9a9a1eed0a978072293a4a4e35a53f0a77655c64a0ad51ca332e138c82a
+      - image: circleci/node:16@sha256:1803e9ed7deec9456ad2609124b7333d40b2eec0cf34998ae766cbf90c9a3625
     steps:
       - checkout
       - restore_cache: