test: support candidate V8 versions

When V8 is built from its master branch, it adds a " (candidate)"
suffix to the version string. Add support for that in the tests so it
does not fail with Node canary.

PR-URL: #13282
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>

test/parallel/test-process-versions.js

@@ -26,5 +26,5 @@ assert(/^\d+\.\d+\.\d+(-.*)?$/.test(process.versions.http_parser));
 assert(/^\d+\.\d+\.\d+(-.*)?$/.test(process.versions.node));
 assert(/^\d+\.\d+\.\d+(-.*)?$/.test(process.versions.uv));
 assert(/^\d+\.\d+\.\d+(-.*)?$/.test(process.versions.zlib));
-assert(/^\d+\.\d+\.\d+(\.\d+)?$/.test(process.versions.v8));
+assert(/^\d+\.\d+\.\d+(\.\d+)?( \(candidate\))?$/.test(process.versions.v8));
 assert(/^\d+$/.test(process.versions.modules));