specreduce: Add Kyle and Clare as maintainers because they already are

[pllim]

@kecnry and @cshanahan1 already have maintainer access to specreduce for a while as individuals and they are actively maintaining the package. I have taken the liberty to clean up specreduce and specreduce-data permissions by doing the following and this PR just making their existing jobs official.

• Remove individuals with only Read access to specreduce. This is unnecessary because it is a public repo. If you want them to have access for triage, create a proper triage team. Refrain from providing arbitrary individual access.
• Added Kyle and Clare to https://github.com/orgs/astropy/teams/specreduce-maintainers and downgrade that team's access from Admin to Maintain.
• Created a new admin team with existing admins (@eteq and @tepickering) and give them back their existing access but under a new team name.

All in all, there are no changes to existing access. I am just making things official. I think it is nice to give people who are doing the work some credit officially.

[hamogu]

Only approving comments on this and the two week comment period has run out, so I'm merging.