update changelog [ci skip]

test: enable l3debug "check-declarations"

fix: inconsistent local/global assignment

ci: bump actions/checkout to v4

test: update luatex .tlg files

ci: still need `l3build unpack`

step version: v0.9a

ci: skip l3build check on windows

fix: expand tabular args in `\@@_cover_id_tabular:n`

refactor: implement secret, id panel with `tabular`

refactor: simplify thesis and degree type; add some `.value_required:n`

feat: allow not to use BibTeX or `biblatex`

ci: update binaries path in TL 2023; update testfiles

fix: expand tabular args in `\@@_cover_info:` to be compatible with `array`

simplify `.gitattributes` [ci skip]