Move @MadVikingGod to Emeritus status (#5856)

Based on a change in role and priorities, @MadVikingGod is no longer
able to focus on OTel. This moves him out of a maintainer role and into
an Emeritus status.

Thank you @MadVikingGod for all the contributions!

CODEOWNERS

@@ -12,6 +12,6 @@
 #  https://help.github.com/en/articles/about-code-owners
 #
 
-* @MrAlias @XSAM @dashpole @MadVikingGod @pellared @hanyuancheung @dmathieu
+* @MrAlias @XSAM @dashpole @pellared @hanyuancheung @dmathieu
 
-CODEOWNERS @MrAlias @MadVikingGod @pellared @dashpole @XSAM @dmathieu
+CODEOWNERS @MrAlias @pellared @dashpole @XSAM @dmathieu

CONTRIBUTING.md

@@ -635,7 +635,6 @@ should be canceled.
 
 ### Maintainers
 
-- [Aaron Clawson](https://github.com/MadVikingGod), LightStep
 - [Damien Mathieu](https://github.com/dmathieu), Elastic
 - [David Ashpole](https://github.com/dashpole), Google
 - [Robert Pająk](https://github.com/pellared), Splunk
@@ -644,11 +643,12 @@ should be canceled.
 
 ### Emeritus
 
-- [Liz Fong-Jones](https://github.com/lizthegrey), Honeycomb
-- [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
-- [Josh MacDonald](https://github.com/jmacd), LightStep
+- [Aaron Clawson](https://github.com/MadVikingGod), LightStep
 - [Anthony Mirabella](https://github.com/Aneurysm9), AWS
 - [Evan Torrie](https://github.com/evantorrie), Yahoo
+- [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
+- [Josh MacDonald](https://github.com/jmacd), LightStep
+- [Liz Fong-Jones](https://github.com/lizthegrey), Honeycomb
 
 ### Become an Approver or a Maintainer