Cargo.lock: bump dependencies (#245)

Updates the following dependencies:

    $ cargo update
    Updating git repository `https://github.com/RustCrypto/AEADs.git`
    Updating git repository `https://github.com/RustCrypto/password-hashes.git`
    Updating git repository `https://github.com/RustCrypto/block-ciphers.git`
    Updating git repository `https://github.com/RustCrypto/block-modes.git`
    Updating git repository `https://github.com/RustCrypto/stream-ciphers.git`
    Updating git repository `https://github.com/RustCrypto/formats.git`
    Updating git repository `https://github.com/RustCrypto/signatures.git`
    Updating git repository `https://github.com/baloo/curve25519-dalek.git`
    Updating git repository `https://github.com/RustCrypto/elliptic-curves.git`
    Updating crates.io index
     Locking 36 packages to latest compatible versions
    Updating aes-gcm v0.11.0-pre (https://github.com/RustCrypto/AEADs.git#d812daa6) -> #ad109f38
    Updating autocfg v1.1.0 -> v1.3.0
    Updating bcrypt-pbkdf v0.11.0-pre.0 (https://github.com/RustCrypto/password-hashes.git#cf91c17c) -> #b06febcc
    Updating blowfish v0.10.0-pre (https://github.com/RustCrypto/block-ciphers.git#d6ed7a2f) -> #ae1892c8
    Updating bytes v1.6.0 -> v1.6.1
    Updating cbc v0.2.0-pre (https://github.com/RustCrypto/block-modes.git#a2d53811) -> #a0051b28
    Updating cpufeatures v0.2.11 -> v0.2.12
    Updating ctr v0.10.0-pre (https://github.com/RustCrypto/block-modes.git#a2d53811) -> #a0051b28
    Updating der v0.8.0-pre.0 (https://github.com/RustCrypto/formats.git#c03c0664) -> #d32a61ea
    Updating dsa v0.7.0-pre (https://github.com/RustCrypto/signatures.git#11ea6380) -> #62419f8b
    Updating ecdsa v0.17.0-pre.5 (https://github.com/RustCrypto/signatures.git#11ea6380) -> #62419f8b
    Updating ed25519 v2.3.0-pre (https://github.com/RustCrypto/signatures.git#11ea6380) -> #62419f8b
    Updating fiat-crypto v0.2.5 -> v0.2.9
    Updating getrandom v0.2.11 -> v0.2.15
    Updating lazy_static v1.4.0 -> v1.5.0
    Updating libc v0.2.150 -> v0.2.155
    Updating num-integer v0.1.45 -> v0.1.46
    Updating num-iter v0.1.43 -> v0.1.45
    Updating num-traits v0.2.17 -> v0.2.19
    Updating opaque-debug v0.3.0 -> v0.3.1
    Updating p256 v0.14.0-pre.0 (https://github.com/RustCrypto/elliptic-curves.git#6ff3bb7d) -> #e6ea0bdc
    Updating p384 v0.14.0-pre (https://github.com/RustCrypto/elliptic-curves.git#6ff3bb7d) -> #e6ea0bdc
    Updating p521 v0.14.0-pre (https://github.com/RustCrypto/elliptic-curves.git#6ff3bb7d) -> #e6ea0bdc
    Updating pbkdf2 v0.13.0-pre.0 (https://github.com/RustCrypto/password-hashes.git#cf91c17c) -> #b06febcc
    Updating pkcs1 v0.8.0-pre.0 (https://github.com/RustCrypto/formats.git#c03c0664) -> #d32a61ea
    Updating pkcs8 v0.11.0-pre.0 (https://github.com/RustCrypto/formats.git#c03c0664) -> #d32a61ea
    Updating primefield v0.14.0-pre (https://github.com/RustCrypto/elliptic-curves.git#6ff3bb7d) -> #e6ea0bdc
    Updating primeorder v0.14.0-pre.0 (https://github.com/RustCrypto/elliptic-curves.git#6ff3bb7d) -> #e6ea0bdc
    Updating rfc6979 v0.5.0-pre.3 (https://github.com/RustCrypto/signatures.git#11ea6380) -> #62419f8b
    Updating sec1 v0.8.0-pre.1 (https://github.com/RustCrypto/formats.git#c03c0664) -> #d32a61ea
    Updating semver v1.0.20 -> v1.0.23
    Updating serde v1.0.192 -> v1.0.204
    Updating serde_derive v1.0.192 -> v1.0.204
    Updating smallvec v1.11.2 -> v1.13.2
    Updating spin v0.5.2 -> v0.9.8
    Updating spki v0.8.0-pre.0 (https://github.com/RustCrypto/formats.git#c03c0664) -> #d32a61ea