www/w3m: Switch upstream source repository
- Switch upstream source repository from Debian Project's repository (https://github.com/tats/w3m) to Rene Kita's repository (https://git.sr.ht/~rkta/w3m) that is forked from Debian Project's repository due to inactivity of the upstream maintainer (https://github.com/tats/w3m/issues/304)
- Update to the snapshot on 2024-09-16 of the new upstream source repository