Since our last round of releases, these crates have had either
trivial changes, or changes that did not affect their APIs.
Therefore we are bumping their versions, but not changing which
versions of them other crates depend on.
"Trivial" here includes stuff like cargo reformatting, comment
edits, error message string changes, and clippy warning changes.
Crates that depend on these do not need to increment.
This is a rough first-cut of an API that I think might help us with
keeping limited categories of sensitive information out of our logs.
I'll refine it based on experiences with using it.