Retemplate all SunPy Maintained Packages

[Cadair]

### Initial Retemplate of all repos
- [ ] mpl-animators : https://github.com/sunpy/mpl-animators/pull/48
- [ ] sunkit-image : https://github.com/sunpy/sunkit-image/pull/202
- [ ] sunkit-pyvista :
- [ ] sunkit-spex :
- [ ] sunkit-instruments :
- [ ] drms : 
- [ ] sunraster : 
- [ ] radiospectra : 
- [ ] pyflct :
- [X] sunkit-dem : https://github.com/sunpy/sunkit-dem/pull/33
- [x] sunpy : https://github.com/sunpy/sunpy/pull/7494
- [x] streamtracer : https://github.com/sunpy/streamtracer/pull/111
- [x] sunkit-magex
- [x] soar : https://github.com/sunpy/sunpy-soar/pull/116
- [x] ndcube : https://github.com/sunpy/ndcube/pull/672

[nabobalis]

I am trying my hand at this with sunkit-dem here: https://github.com/sunpy/sunkit-dem/pull/33

[Cadair]

Thanks @nabobalis