Skip a process test on Cygwin to avoid hang

* test/src/process-tests.el
(process-tests/fd-setsize-no-crash/make-network-process): Skip
test on Cygwin to avoid hang due to connect/accept handshake.
(Bug#49496)
8 jobs for master in 20 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Prep Images
failed #23077
prep-image-base

00:00:20

 
  Build Images
skipped #23078
build-image-inotify
 
  Platform Images
skipped #23079
build-image-filenotify-gio
skipped #23080
build-image-gnustep
 
  Platforms
skipped #23081
test-filenotify-gio
skipped #23082
test-gnustep
 
  Native Comp Images
skipped #23083
build-native-bootstrap-speed0
 
  Slow
skipped #23084
test-all-inotify
 
Name Stage Failure
failed
prep-image-base Prep Images There has been a runner system failure, please try again
$ git config --global http.proxy $HTTP_PROXY; git config --global https.proxy $HTTPS_PROXY
Fetching changes with git depth set to 50...
Reinitialized existing Git repository in /builds/emacs/emacs/.git/
From https://emba.gnu.org/emacs/emacs
* [new ref] 3fa711c11d1497418fdf8a866b7ba52dd3b00e0e -> refs/pipelines/11356
Checking out 3fa711c1 as master...

Skipping Git submodules setup
ERROR: Job failed (system failure): Error response from daemon: Conflict. The container name "/runner-2oEDrUT7-project-1-concurrent-1-build-4" is already in use by container "f46df44a43bee1f61a6ede2eac732a4e06eaa2094659f7ea23718f093d67bcc6". You have to remove (or rename) that container to be able to reuse that name. (executor_docker.go:726:0s)