Merge pull request #2013 from sydduckworth/update_rtd_build_os

Updated RTD build OS from Ubuntu 20.04 to 24.04

Merge pull request #2008 from sydduckworth/asdffile_impl_delitem

fixed broken reference in changelog entry

changed changelog entry from feature to bug to match source issue

added changelog entry

added __delitem__ method to AsdfFile

Merge pull request #2007 from braingram/release_5p2p0

update changelog for 5.2.0 release

Merge pull request #2006 from braingram/rm_remote_data

remove pytest-remotedata

replace httpstat with httpserver

Merge pull request #1999 from braingram/fix_validation

describe caching

avoid reference cycle