* docs/release: Fix `scp` usage with OpenSSH version >= 9.0.

Starting with this version, OpenSSH uses `scp` with the SFTP protocol as the
default.  However, SFTP is disabled on savannah.gnu.org since January 2025.
diff --git a/docs/release b/docs/release
index ffaa1f5..f1a0f65 100644
--- a/docs/release
+++ b/docs/release
@@ -166,7 +166,7 @@
                     $FT2DEMOS_SIGNATURES \
                     $FTDOC_SIGNATURES"
 
-    scp $PACKAGE_LIST $SIGNATURE_LIST \
+    scp -O $PACKAGE_LIST $SIGNATURE_LIST \
       $SAVANNAH_USER@dl.sv.nongnu.org:/releases/freetype/
 
     rsync -avP -e ssh $FREETYPE_PACKAGES $FREETYPE_SIGNATURES \