ci: update Node.js to version 12.20 from 12.18

This is needed for `tests/legacy-cli/e2e/tests/update/update-7.0.ts` due to `The Angular CLI requires a minimum Node.js version of either v12.20, v14.15, or v16.10.`

.circleci/config.yml

@@ -17,9 +17,9 @@ orbs:
 ## IMPORTANT
 # Windows needs its own cache key because binaries in node_modules are different.
 # See https://circleci.com/docs/2.0/caching/#restoring-cache for how prefixes work in CircleCI.
-var_1: &cache_key angular_devkit-12.18-{{ checksum "yarn.lock" }}
-var_1_win: &cache_key_win angular_devkit-win-12.18-{{ checksum "yarn.lock" }}
-var_3: &default_nodeversion "12.18"
+var_1: &cache_key angular_devkit-12.20-{{ checksum "yarn.lock" }}
+var_1_win: &cache_key_win angular_devkit-win-12.20-{{ checksum "yarn.lock" }}
+var_3: &default_nodeversion "12.20"
 # Workspace initially persisted by the `setup` job, and then enhanced by `setup-and-build-win`.
 # https://circleci.com/docs/2.0/workflows/#using-workspaces-to-share-data-among-jobs
 # https://circleci.com/blog/deep-diving-into-circleci-workspaces/