fix(owners): set correct mail-address

Signed-off-by: Christopher Haar <christopher.haar@upbound.io>

Author: haarchri

OWNERS.md

@@ -11,7 +11,7 @@ This page lists all maintainers for **this** repository. Each repository in the
 repository maintainers in their own `OWNERS.md` file.
 
 ## Maintainers
-* Hasan Turken <hasan@upbound.com> ([turkenh](https://github.com/turkenh))
+* Hasan Turken <hasan@upbound.io> ([turkenh](https://github.com/turkenh))
 * Bob Haddleton <bob.haddleton@nokia.com> ([bobh66](https://github.com/bobh66))
 
 See [CODEOWNERS](./CODEOWNERS) for automatic PR assignment.