tailcfg: bump CurrentCapabilityVersion for EarlyNoise
Updates
// - 46: 2022-10-04: c2n /debug/component-logging
// - 47: 2022-10-11: Register{Request,Response}.NodeKeySignature
// - 48: 2022-11-02: Node.UnsignedPeerAPIOnly
-const CurrentCapabilityVersion CapabilityVersion = 48
+// - 49: 2022-11-03: Client understands EarlyNoise
+const CurrentCapabilityVersion CapabilityVersion = 49
type StableID string
