contextual logging: fix stage

Author: pohly

keps/sig-instrumentation/3077-contextual-logging/kep.yaml

@@ -19,7 +19,7 @@ see-also:
   - "/keps/sig-instrumentation/1602-structured-logging"
 
 # The target maturity stage in the current dev cycle for this KEP.
-stage: alpha
+stage: beta
 
 # The most recent milestone for which work toward delivery of this KEP has been
 # done. This can be the current (upcoming) milestone, if it is being actively