test: fix tests for npm 7.0.0

PR-URL: #35631
Reviewed-By: Ben Coe <bencoe@gmail.com>
Reviewed-By: Ruy Adorno <ruyadorno@github.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

test/parallel/test-npm-version.js

@@ -14,5 +14,5 @@ const npmPathPackageJson = path.resolve(
 );
 
 const pkg = require(npmPathPackageJson);
-assert(pkg.version.match(/^\d+\.\d+\.\d+-rc\.\d+$/),
+assert(pkg.version.match(/^\d+\.\d+\.\d+$/),
        `unexpected version number: ${pkg.version}`);