Append \everypar toks to \g__para_standard_everypar_tl

[muzimuzhi]

Fix rollback 2023/06/01 of \g__para_standard_everypar_tl, labeled "minipage fix". See #1386.

Internal housekeeping

Status of pull request

• Feedback wanted
• Ready to merge

Checklist of required changes before merge will be approved

• [x] Test file(s) added
• [x] Version and date string updated in changed source files
• [x] Relevant \changes entries in source included
• [x] Relevant changes.txt updated
• [ ] Rollback provided (if necessary)?
• [x] ltnewsX.tex (and/or latexchanges.tex) updated

[muzimuzhi]

Need a ltnews40 entry?

[muzimuzhi]

The base branch of this PR is changed from develop to main, and I've moved ltnews entry to ltnews39.tex, adapted changes entry, and updated date.