[newlib-cygwin/cygwin-3_5-branch] Cygwin: CI: update deprecated artifacts action

[Jon Turney]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=437ca2d7117836a3b2abe6876acbb129ce550ba5

commit 437ca2d7117836a3b2abe6876acbb129ce550ba5
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Sun Jan 19 15:28:31 2025 +0000

    Cygwin: CI: update deprecated artifacts action
    
    (cherry picked from commit ca22984cc4ad720d186797dcd8aafa295bc7fde1)

Diff:
---
 .github/workflows/cygwin.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index be377bb3b..803462a01 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -168,7 +168,7 @@ jobs:
 
     # upload test logs to facilitate investigation of problems
     - name: Upload test logs
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: testlogs
         path: |