Remove upstream urls from checksums.ini that point to trac #35023
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As part of the transition to github, this PR removes some references to the trac server from the Sage source.
📚 Description
I split off this PR from the main effort at #35015 since I wasn't sure what to do with some checksum links. After some discussion, @dimpase and @mkoeppe noted that the links could just be deleted. This PR will fix #35014.