update changelog for 1.1.0

[braingram]

Regtests:
jwst: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1264/
romancal: https://plwishmaster.stsci.edu:8081/job/RT/job/Roman-Developers-Pull-Requests/626/

This PR does not yet mark 1.6.0 as "stable". I think the safest bet is to first make an asdf PR that makes it stable in asdf main. When all issues have been sorted, make another asdf-standard release with 1.6.0 stable (so we have a window to make changes) perhaps increasing the version to 1.6.0. Then make an asdf release (so the pypi version has 1.6.0 as stable).

[braingram]

The 3 weldx errors are unrelated:
https://github.com/asdf-format/asdf-standard/actions/runs/8157916385/job/22298633018?pr=427#step:8:150
and are due to the lack of a "media" install extras (like is used in asdf):
https://github.com/asdf-format/asdf/blob/4a0064aa48d6360d27ab588b2bb85255016e3876/tox.ini#L304

The asdf-astropy errors are due to it testing 1.6.0 and not yet being aware of the astronomy manifest (which is now the home for time):

asdf-standard/resources/manifests/asdf-format.org/astronomy/astronomy-1.0.0.yaml

Line 60 in 33ea4d3

- tag_uri: tag:stsci.edu:asdf/time/time-1.2.0

Once asdf-standard 1.1.0 is release this PR can be updated fixing asdf-astropy:
astropy/asdf-astropy#219

sunpy dev no longer supports 3.9 which is the version that is attempted in this PR:
https://github.com/asdf-format/asdf-standard/actions/runs/8157916385/job/22298633325?pr=427#step:6:37

#428 should address all of these except the asdf-astropy failures

[braingram]

jwst failures are due to lack of a crds cache. regtests will serve as a better test for jwst compatibility.

[braingram]

Regtests all passed with no issues.