It's not immediately obvious, but the tag and commit links to the left of the release (under the green "latest release" label) actually do that.

The tag link points to the tree (in Github's file browser UI) for the release, and the commit ID link points to the specific commit for that tag (in Github's diff UI).

Trouble is, this isn't very discoverable, given that those two links aren't styled as links-- they're the same font and color as is used for the subheading with date and commits since, which aren't clickable elements.