Prepare for v0.16.15 release

Signed-off-by: Michi Mutsuzaki <michi@isovalent.com>

Author: michi-covalent

README.md

@@ -43,7 +43,7 @@ binary releases.
 
 | Release                                                                | Maintained | Compatible Cilium Versions |
 |------------------------------------------------------------------------|------------|----------------------------|
-| [v0.16.14](https://github.com/cilium/cilium-cli/releases/tag/v0.16.14) | Yes        | Cilium 1.15 and newer      |
+| [v0.16.15](https://github.com/cilium/cilium-cli/releases/tag/v0.16.15) | Yes        | Cilium 1.15 and newer      |
 | [v0.15.22](https://github.com/cilium/cilium-cli/releases/tag/v0.15.22) | Yes        | Cilium 1.14 (*)            |
 
 Note: 

RELEASE.md

@@ -19,7 +19,7 @@ table](https://github.com/cilium/cilium-cli#releases) for the most recent suppor
 Set `RELEASE` environment variable to the new version. This variable will be
 used in the commands throughout the documenat to allow copy-pasting.
 
-    export RELEASE=v0.16.15
+    export RELEASE=v0.16.16
 
 ## Update local checkout