Log Message:
minisign: update to 0.9.

ChangeLog:

- New option: -R to recover the public key from a secret key.
- minisign can now be compiled to WebAssembly.
- Error messages have been improved.
- Key derivation is now possible on devices with limited memory.
- Compilation on OpenWRT is now possible using cmake.
- A Docker image is now available.
- 64-bit Windows binaries have been added, and macOS binaries are notarized.