test: set test-http-regr-gh-2928 as flaky

Author: anonrig

test/sequential/sequential.status

@@ -14,8 +14,12 @@ test-watch-mode-inspect: PASS, FLAKY
 [$system==win32]
 # https://github.com/nodejs/node/issues/47116
 test-http-max-sockets: PASS, FLAKY
+# https://github.com/nodejs/node/issues/49564
+test-http-regr-gh-2928: PASS, FLAKY
 
 [$system==linux]
+# https://github.com/nodejs/node/issues/49564
+test-http-regr-gh-2928: PASS, FLAKY
 
 [$system==macos]