add changelogs for Cabal-3.6.2.0 and cabal-install-3.6.2.0 (#7721) (#7722)

(cherry picked from commit c6cbebde)

# Conflicts:
#	changelog.d/issue-4683
#	changelog.d/option-argument-errors
#	changelog.d/pr-7296
#	changelog.d/pr-7358
#	changelog.d/pr-7536

Co-authored-by: Emily Pillmore <emilypi@cohomolo.gy>