Propose Scott Seago as a maintainer (#3747)

* Propose Scott Seago as a maintainer

Scott Seago has made a lot of contributions to Velero, including in
testing, coding, and design.

Some examples of his contributions include a [design for plugin
improvements](https://github.com/vmware-tanzu/velero/blob/main/design/wait-for-additional-items.md),
[added skip support to
RestoreItemActions](#1336),
and [reporting important
issues](#2948).

He's also been active in the community meetings for the last few years,
and has had thoughtful feedback.

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Fix up file assignments

Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

.github/auto-assignees.yml

@@ -15,6 +15,7 @@ reviewers:
       - zubron
       - dsu-igeek
       - jenting
+      - sseago
 
     tech-writer:
       - a-mccarthy

MAINTAINERS.md

@@ -11,7 +11,8 @@
 | Ashish Amarnath | [ashish-amarnath](https://github.com/ashish-amarnath) | [VMware](https://www.github.com/vmware/) |
 | Bridget McErlean | [zubron](https://github.com/zubron) | [VMware](https://www.github.com/vmware/) |
 | Dave Smith-Uchida | [dsu-igeek](https://github.com/dsu-igeek) | [VMware](https://www.github.com/vmware/) |
-| JenTing Hsiao | [jenting](https://github.com/jenting) | [SUSE](https://github.com/SUSE/) 
+| JenTing Hsiao | [jenting](https://github.com/jenting) | [SUSE](https://github.com/SUSE/)
+| Scott Seago | [sseago](https://github.com/sseago) | [OpenShift](https://github.com/openshift)
 
 ## Emeritus Maintainers
 * Adnan Abdulhussein ([prydonius](https://github.com/prydonius))