Fix trac links

[cofinoa]

This is a link fixing

Release checklist

• [NA] Authors updated in cf-conventions.adoc? Add in two places: on line 3 and under .Additional Authors in About the authors.
• [NA] Next version in cf-conventions.adoc up to date? Versioning inspired by SemVer.
• [] history.adoc up to date?
• [NA] Conformance document up to date?

For maintainers

After the merge remember to delete the source branch. Tags are set at the conclusion of the annual meeting; until then, main always is a draft for the next version.

[cofinoa]

@sadielbartholomew I have fixed the broken links to the old Trac tickets.

Also, I have replaced an HTTP link with the correspondent working HTTPS