test: fix flaky https tests on windows

The test-https-server-options-incoming-message and
test-https-server-options-server-response tests can
be flaky on Windows.

Opencode/Opus helped figure out why.

Author: jasnell

test/parallel/test-https-server-options-incoming-message.js

@@ -44,6 +44,7 @@ server.on('listening', common.mustCall(function makeRequest() {
   }, common.mustCall((res) => {
     assert.strictEqual(res.statusCode, 200);
     res.on('end', () => {
+      server.closeAllConnections();
       server.close();
     });
     res.resume();

test/parallel/test-https-server-options-server-response.js

@@ -40,6 +40,7 @@ server.on('listening', common.mustCall(function makeRequest() {
   }, common.mustCall((res) => {
     assert.strictEqual(res.statusCode, 200);
     res.on('end', () => {
+      server.closeAllConnections();
       server.close();
     });
     res.resume();