wip: upgrade vsss_rs to 5.1.0

This update becamse necessary because the old version of `vsss-rs` was
holding back the RustCrypto crates (p256, rsa etc) w/ shared / conflicting
dependencies. This is evident in the net loss in the Cargo.lock file
despite adding a new dependency.

We maintain backward compatibility w/ the hex format for shares when
they're output through the printer and input via stdio. Share I/O using
ISO & CDW now serialize shares as JSON. I'm not wild about serializing
types from a dependency as we don't control if / when these might
change but for now we're no worse off than we were.

This has been tested by creating, destroying, and then recovering OKS
instances w/ shares round tripped through:
- printer output, stdio input
- ISO output & input
- CDW output & CDR input

Cargo.toml

@@ -16,9 +16,7 @@ log = "0.4.22"
 lpc55_sign = { git = "https://github.com/oxidecomputer/lpc55_support", default-features = false, version = "0.3.4" }
 lpc55_areas = { git = "https://github.com/oxidecomputer/lpc55_support", default-features = false, version = "0.2.4" }
 num-bigint = "0.4.6"
-# p256 v0.13 has a dependency that requires rustc 1.65 but we're pinned
-# to 1.64 till offline-keystore-os supports it
-p256 = "0.12"
+p256 = "0.13"
 pem-rfc7468 = { version = "0.7.0", features = ["alloc", "std"] }
 rand = "0.8.5"
 rand_core = { version = "0.6.4", features = ["std"] }
@@ -30,9 +28,7 @@ static_assertions = "1.1.0"
 tempfile = "3.13.0"
 textwrap = "0.16.1"
 thiserror = "1.0.64"
-# vsss-rs v3 has a dependency that requires rustc 1.65 but we're pinned
-# to 1.64 till offline-keystore-os supports it
-vsss-rs = "2.7.1"
+vsss-rs = "5.1.0"
 x509-cert = "0.2.5"
 yubihsm = { git = "https://github.com/oxidecomputer/yubihsm.rs", branch = "session-close", features = ["usb", "untested"] }
 zeroize = "1.8.1"
@@ -41,3 +37,4 @@ glob = "0.3.2"
 rsa = "0.9.3"
 sha2 = "0.10.8"
 zerocopy = { version = "0.8.17", features = ["derive", "std", "zerocopy-derive"] }
+const_format = "0.2.34"