Update stable release to 1.18.6

Signed-off-by: Glib Smaga <code@gsmaga.com>

Author: glibsm

README.md

@@ -72,7 +72,7 @@ this reason, only the latest Hubble CLI version is maintained.
 
 | Version                                              | Release Date         | Maintained | Supported Cilium Version | Artifacts                                                               |
 |------------------------------------------------------|----------------------|------------|--------------------------|-------------------------------------------------------------------------|
-| [v1.18](https://github.com/cilium/hubble/tree/main)  | 2026-01-05 (v1.18.5) | Yes        | Cilium 1.18 and older    | [GitHub Release](https://github.com/cilium/hubble/releases/tag/v1.18.5) |
+| [v1.18](https://github.com/cilium/hubble/tree/main)  | 2026-02-03 (v1.18.6) | Yes        | Cilium 1.18 and older    | [GitHub Release](https://github.com/cilium/hubble/releases/tag/v1.18.6) |
 
 ## Component Stability
 

stable.txt

@@ -1 +1 @@
-v1.18.5
+v1.18.6