* gnu/packages/crates-io.scm (rust-cargo): Update to 0.76.
[source]: Remove snippet.
[cargo-inputs]: Add rust-anystream-0.6, rust-anstyle-1,
rust-color-print-0.3, rust-serde-untagged-0.1,
rust-supports-hyperlinks-2. Replace rust-cargo-credential-0.3 with 0.4,
rust-cargo-credential-libsecret-0.3 with 0.4,
rust-cargo-credential-macos-keychain-0.3 with 0.4,
rust-cargo-credential-wincred-0.3 with 0.4, rust-crates-io-0.38 with
0.39, rust-git2-0.17 with 0.18, rust-git2-curl-0.18 with 0.19,
rust-gix-0.45 with 0.55, rust-gix-features-0.30 with 0.35,
rust-itertools-0.10 with 0.11, rust-libgit2-sys-0.15 with 0.16,
rust-toml-0.7 with 0.8, rust-toml-edit-0.19 with 0.20. Remove
rust-fwdansi-1, rust-strip-ansi-escapes-0.1, rust-termcolor-1.
[inputs]: Replace libgit2-1.6 with 1.7.
Change-Id: I6a46b9d95dab076d0ff238d6b34902da512f1468
