chore(deps): update npm to v7 (#2146)

* chore(deps): update npm to v7

* chore: Ensure all CI jobs run 'npm ci' using the latest npm version

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Luca Greco <lgreco@mozilla.com>

.circleci/config.yml

@@ -83,10 +83,13 @@ commands:
           paths:
             - ./node_modules
 
+  # NOTE: The package lock file format generated by more recent npm version (currently v7)
+  # is incompatible with npm v6, and so here we run `npm ci` using the last npm version
+  # indipendently from which is the nodejs version that the CI job is running for (See #2145).
   run_npm_ci:
     description: install npm dependencies
     steps:
-      - run: npm ci
+      - run: npx npm@latest ci
 
   run_npm_build:
     description: build project in << parameters.node_env >> mode

package.json

@@ -16,7 +16,7 @@
   ],
   "engines": {
     "node": ">=12.0.0",
-    "npm": ">=6.9.0 <7.0.0"
+    "npm": ">=6.9.0"
   },
   "engine-strict": true,
   "bin": {