feat: update Flannel to v0.27.4

Also add renovate tags.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

hack/release.toml

@@ -27,6 +27,7 @@ systemd-udevd: 257.8
 runc: 1.3.1
 CoreDNS: 1.12.4
 etcd: 3.6.5
+Flannel: 0.27.4
 
 Talos is built with Go 1.25.1.
 """

pkg/machinery/constants/constants.go

@@ -1184,7 +1184,12 @@ const (
 	DashboardTTY = 2
 
 	// FlannelVersion is the version of flannel to use.
-	FlannelVersion = "v0.27.2"
+	//
+	// Note: while updating, make sure to copy flannel image from docker.io to ghcr.io:
+	//   crane cp docker.io/flannel/flannel:vX.Y.Z ghcr.io/siderolabs/flannel:vX.Y.Z
+	//
+	// renovate: datasource=github-releases depName=flannel-io/flannel
+	FlannelVersion = "v0.27.4"
 
 	// PlatformMetal is the name of the metal platform.
 	PlatformMetal = "metal"