[newlib-cygwin/main] Cygwin: CI: Use git protocol to clone stc repo

[Jon Turney]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2fa3829922a80ed64b676ae5a2fc975cad6d1cbf

commit 2fa3829922a80ed64b676ae5a2fc975cad6d1cbf
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Thu Aug 6 15:08:52 2026 +0100

    Cygwin: CI: Use git protocol to clone stc repo
    
    This might be more reliable if the http service is being DDoS'ed.

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 28f3a5d98..75225df24 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -324,7 +324,7 @@ jobs:
       run: |
         export PATH=/usr/bin:$(cygpath ${SYSTEMROOT})/system32
         uname -a
-        git clone https://cygwin.com/git/cygwin-apps/stc.git --depth 1
+        git clone git://cygwin.com/git/cygwin-apps/stc.git --depth 1
         meson setup _build stc
         ninja -C _build
       shell: bash --noprofile --norc -o igncr -eo pipefail '{0}'