> Last update was in 2017.
> Updates tinyformat to upstream commit 705e3f4e1de922069bf715746d35bd2364b1f98f.
> Re-apply bitcoin specific changes.
> No changes that affect our use, as far as I can see, but this gets rid
> of the gcc `-Wimplicit-fallthrough` warnings, at least.
This is a backport of Core PR17682