Retire @tbg

I am on leave starting July 31.

Signed-off-by: Tobias Grieger <[email protected]>

MAINTAINERS

@@ -15,7 +15,9 @@ Hitoshi Mitake <[email protected]> (@mitake) *
 Marek Siarkowicz <[email protected]> <[email protected]> (@serathius) *
 Piotr Tabor <[email protected]> (@ptabor) *
 Sahdev Zala <[email protected]> (@spzala) *
-Tobias Grieger <[email protected]> (@tbg) *
 
 # REVIEWERS
 Pavel Kalinnikov <[email protected]> (@pavelkalinnikov) *
+
+# EMERITUS MAINTAINERS
+Tobias Grieger <[email protected]> (@tbg) *