CI: keep Node.js up to date with 'current'

Author: emmercm

.github/renovate.json5

@@ -62,7 +62,6 @@
       matchPackageNames: ['node'],
       groupName: 'Node.js',
       // Keep Node.js on the 'current' major version (as opposed to LTS)
-      versioning: 'node',
       allowedVersions: '/^\\d*[02468]\\./',
       // The Docker images (used to build executables) frequently don't get published until days
       //  after the Node.js version was updated, so try to prevent immediately failing PRs