This updates minisign to the latest version. One new thing is that minisign (not go-minisign) has started to prehash the file, and in order to make geth pass the version-check, we need to sign the file in legacy-mode.
* cmd/geth: implement vulnerability check
* cmd/geth: use minisign to verify vulnerability feed
* cmd/geth: add the test too
* cmd/geth: more minisig/signify testing
* cmd/geth: support multiple pubfiles for signing
* cmd/geth: add @holiman minisig pubkey
* cmd/geth: polishes on vulnerability check
* cmd/geth: fix ineffassign linter nit
* cmd/geth: add CVE to version check struct
* cmd/geth/testdata: add missing testfile
* cmd/geth: add more keys to versionchecker
* cmd/geth: support file:// URLs in version check
* cmd/geth: improve key ID printing when signature check fails
Co-authored-by: Felix Lange <fjl@twurst.com>
