Tagged retroactively. This is the commit the 0.5.1 NuGet packages and the
ghcr.io/iyulab/morphdb:0.5.1 image were built from -- the release workflow at
the time published artifacts without recording a tag, so the newest tag in the
repository stayed at v0.2.1 while releases had reached 0.5.1. A consumer reading
the repository to decide what to pin therefore found a version four minors old.
Releases tag themselves from d40b8ee onward.