Promote @songy23 to maintainer (open-telemetry#37226)

Thanks for all your continued efforts @songy23!

Signed-off-by: Alex Boten <[email protected]>

README.md

@@ -93,7 +93,6 @@ Approvers ([@open-telemetry/collector-contrib-approvers](https://github.com/orgs
 - [Curtis Robert](https://github.com/crobert-1), Splunk
 - [David Ashpole](https://github.com/dashpole), Google
 - [Matt Wear](https://github.com/mwear), Lightstep
-- [Yang Song](https://github.com/songy23), DataDog
 - [Ziqi Zhao](https://github.com/fatsheep9146), Alibaba
 
 Emeritus Approvers:
@@ -115,6 +114,7 @@ Maintainers ([@open-telemetry/collector-contrib-maintainer](https://github.com/o
 - [Pablo Baeyens](https://github.com/mx-psi), DataDog
 - [Sean Marciniak](https://github.com/MovieStoreGuy), Splunk
 - [Tyler Helmuth](https://github.com/TylerHelmuth), Honeycomb
+- [Yang Song](https://github.com/songy23), DataDog
 
 Emeritus Maintainers