MAINTAINERS.yml: Add SebastianBoe as build collaborator

Adding myself as build collaborator as requested by Carles.

Will hopefully let code review go smoother.

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
diff --git a/MAINTAINERS.yml b/MAINTAINERS.yml
index 8b4c5a6..0c828cf 100644
--- a/MAINTAINERS.yml
+++ b/MAINTAINERS.yml
@@ -221,6 +221,7 @@
         - tejlmand
     collaborators:
         - nashif
+        - SebastianBoe
     files:
         - cmake/
         - CMakeLists.txt