leiningen: use codeberg for master_sites, update version to 2.9.10

[kakuhen]

Description

• closes https://trac.macports.org/ticket/65647
• use codeberg in master_sites
• update version to 2.9.10
• remove outdated comment that applies to the GitHub portgroup

Type(s)

• [ ] bugfix
• [x] enhancement
• [ ] security fix

Tested on

macOS 10.15.7 19H2026 x86_64 Xcode 12.4 12D4e

Verification

Have you

• [x] followed our Commit Message Guidelines?
• [x] squashed and minimized your commits?
• [x] checked that there aren't other open pull requests for the same change?
• [x] referenced existing tickets on Trac with full URL?
• [x] checked your Portfile with port lint --nitpick?
• [ ] tried existing tests with sudo port test?
• [x] tried a full install with sudo port -vst install?
• [x] tested basic functionality of all binary files?

[macportsbot]

Notifying maintainers: @easye for port leiningen.

[easye]

Pulling the trigger on this for kakuhen, who uses Leiningen more than I do.