Remove Docker patch already included in v28.5.2 (#4398)

This reverts commit b3a9e76521.

buildroot-external/patches/docker-engine/0001-Unmap-IPv4-addresses-loaded-from-store.patch

@@ -1,33 +0,0 @@
-From 050f3d1930d9bf4fea986ed21feaaa6474822191 Mon Sep 17 00:00:00 2001
-From: Rob Murray <rob.murray@docker.com>
-Date: Wed, 27 Aug 2025 16:37:00 +0100
-Subject: [PATCH] Unmap IPv4 addresses loaded from store
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-When a endpoint's net.IPNet is loaded from store and converted
-to a netip.Addr, unmap it so that iptables rules don't contain
-IPv4-mapped IPv6 addresses.
-
-Signed-off-by: Rob Murray <rob.murray@docker.com>
-(cherry picked from commit 071e6472db32a34ed0f73f7166e0c2b405ae23a5)
-Signed-off-by: Rob Murray <rob.murray@docker.com>
-(backported for 28.3.3 from 31f405932a349e99f45388afe764ec5433b30de2)
-Signed-off-by: Jan Čermák <sairon@sairon.cz>
----
- libnetwork/drivers/bridge/bridge_linux.go | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/libnetwork/drivers/bridge/bridge_linux.go b/libnetwork/drivers/bridge/bridge_linux.go
-index 19fcf43..15002f2 100644
---- a/libnetwork/drivers/bridge/bridge_linux.go
-+++ b/libnetwork/drivers/bridge/bridge_linux.go
-@@ -1218,6 +1218,7 @@ func (d *driver) CreateEndpoint(ctx context.Context, nid, eid string, ifInfo dri
- func (ep *bridgeEndpoint) netipAddrs() (v4, v6 netip.Addr) {
- 	if ep.addr != nil {
- 		v4, _ = netip.AddrFromSlice(ep.addr.IP)
-+		v4 = v4.Unmap()
- 	}
- 	if ep.addrv6 != nil {
- 		v6, _ = netip.AddrFromSlice(ep.addrv6.IP)