chore: checkpoint before Python removal

vendor/base16ct/Cargo.toml

@@ -0,0 +1,48 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.60"
+name = "base16ct"
+version = "0.2.0"
+authors = ["RustCrypto Developers"]
+description = """
+Pure Rust implementation of Base16 a.k.a hexadecimal (RFC 4648) which avoids
+any usages of data-dependent branches/LUTs and thereby provides portable
+\"best effort\" constant-time operation and embedded-friendly no_std support
+"""
+documentation = "https://docs.rs/base16ct"
+readme = "README.md"
+keywords = [
+    "crypto",
+    "hex",
+    "hexadecimal",
+]
+categories = [
+    "cryptography",
+    "encoding",
+    "no-std",
+    "parser-implementations",
+]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/RustCrypto/formats/tree/master/base16ct"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = [
+    "--cfg",
+    "docsrs",
+]
+
+[features]
+alloc = []
+std = ["alloc"]