chore(tests): don’t keep HTTP connections alive (#645)

This change almost halves the time it takes to run `tests/main.test.ts`.

Author: geigerzaehler

tests/_registryServer.mjs

@@ -111,6 +111,8 @@ function generateVersionMetadata(packageName, version) {
 const TOKEN_MOCK = `SOME_DUMMY_VALUE`;
 
 const server = createServer((req, res) => {
+  res.setHeader(`connection`, `close`);
+
   const auth = req.headers.authorization;
 
   if (