Update arm64 modules patch for Talos v1.12.4 (add ip6_gre)

Talos v1.12.4 added kernel/net/ipv6/ip6_gre.ko to modules-arm64.txt.
Update our patch to match. Also silence gmake checkouts-clean stdout
in auto-update.sh to prevent it leaking into GITHUB_OUTPUT.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/auto-update.sh

@@ -83,11 +83,11 @@ fi
 echo "Running patch smoke test ..." >&2
 if ! gmake checkouts patches; then
   echo "Patches failed to apply!" >&2
-  gmake checkouts-clean 2>/dev/null || true
+  gmake checkouts-clean >/dev/null 2>&1 || true
   echo "patch_failed=true"
   exit 0
 fi
-gmake checkouts-clean
+gmake checkouts-clean >/dev/null 2>&1
 
 # ── Generate tag ────────────────────────────────────────────────────
 TALOS_VER=$(grep '^TALOS_VERSION' "$MAKEFILE" | awk '{print $NF}')