test: remove test-child-process-fork-args flaky designation

test-child-process-fork-args does not appear in results from `ncu-ci
walk commit` and no one has reported it failing for several months.
A stress test also passed.

Closes: #32863

PR-URL: #34684
Fixes: #32863
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Pranshu Srivastava <rexagod@gmail.com>

Author: Trott

test/parallel/parallel.status

@@ -7,8 +7,6 @@ prefix parallel
 [true] # This section applies to all platforms
 
 [$system==win32]
-# https://github.com/nodejs/node/issues/32863
-test-child-process-fork-args: PASS,FLAKY
 # https://github.com/nodejs/node/issues/20750
 test-http2-client-upload: PASS,FLAKY
 # https://github.com/nodejs/node/issues/20750