re-add go.work.sum to git once renovate can update it correctly

[Luap99]

revert 0ed1f19 once renovate can handle updates to it correctly so we don't always have a local diff when running go commands

see #362 (comment)

[lsm5]

how about #370 ?

[mtrmac]

I think the two are sort of alternative ways to achieve ~the same thing: we’d like to notice if a dependency’s tag changes. We can achieve that either by committing vendor or by committing *.sum. (In addition, committing vendor, sort of, protects us in case the dependency went away completely.)

[mtrmac]

This happened in #410 .