Run test-go-mod unpinned

[KnVerey]

Continues the work in #4975
Closes #4975

Note: running this version of make test-go-mod generates a huge diff in go.mod/go.sum files. Presumably those are reflecting all the real dependency changes that have happened since the last release, and will show up when we update the module pins during the release. In our old workflow where we kept the "unpinning" replace statements committed on master between releases, these updates would presumably have appeared across modules as we made them. This introduces some complexity for #4975, essentially unless we start committing the unpinned results (but does that make sense?). In essence, we're jumping through hoops to avoid committing the replace statements, and we might want to re-reconsider that.

/cc @natasha41575 @annasong20

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[annasong20]

/label tide/merge-method-squash

[annasong20]

/lgtm

I learned so much from this PR!

[annasong20]

Brilliant! Thank you, @KnVerey! Your code led me to the package template docs. I was missing the double quotes!