test: remove FLAKY for test-http2-compat-client-upload-reject

As far as I know, this test hasn't failed since around the time it was
first reported in 2019.

Closes: #30847

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/30847
-test-http2-compat-client-upload-reject: PASS,FLAKY
 # https://github.com/nodejs/node/issues/30845
 test-http2-multistream-destroy-on-read-tls: PASS,FLAKY
 # https://github.com/nodejs/node/issues/20750