Update maintainers emails (#882)

Signed-off-by: Camila Vilarinho <[email protected]>
Co-authored-by: Kairo Araujo <[email protected]>

Author: camilaavilarinho

MAINTAINERS.rst

@@ -4,7 +4,7 @@ Maintainers
 Kairo de Araujo
 ---------------
 
-Email: [email protected]
+Email: [email protected]
 
 GitHub username: @kairoaraujo
 
@@ -18,13 +18,13 @@ GitHub username: @KAUTH
 Martin Vrachev
 --------------
 
-Email: mvrachev@vmware.com
+Email: martin.vrachev@gmail.com
 
 GitHub username: @MVrachev
 
 Radoslav Dimitrov
 -----------------
 
-Email: dimitrovr@vmware.com
+Email: radoslav@stacklok.com
 
 GitHub username: @rdimitrov