tailcfg: bump capver for ingress
Updates tailscale/corp#7515
// - 47: 2022-10-11: Register{Request,Response}.NodeKeySignature
// - 48: 2022-11-02: Node.UnsignedPeerAPIOnly
// - 49: 2022-11-03: Client understands EarlyNoise
-const CurrentCapabilityVersion CapabilityVersion = 49
+// - 50: 2022-11-14: Client understands CapabilityIngress
+const CurrentCapabilityVersion CapabilityVersion = 50
type StableID string
