Nominate Xiaoxuan Wang (@wangxiaoxuan273) as a maintainer of the
`setup-oras` repository.
Xiaoxuan has contributed and merged `6` PRs in the past year. Since
Xiaoxuan is an active contributor of the `oras` repository, she will
update the `setup-oras` in a quicker way when there is a new `oras` CLI
release.
Signed-off-by: Shiwei Zhang <shizh@microsoft.com>
Co-authored-by: Sajay Antony <sajaya@microsoft.com>