Bump x25519-dalek from `2cd2697` to `459bb04`
Bump x25519-dalek from `2cd2697` to `459bb04`

Bumps [x25519-dalek](https://github.com/novifinancial/x25519-dalek) from `2cd2697` to `459bb04`.
- [Release notes](https://github.com/novifinancial/x25519-dalek/releases)
- [Commits](https://github.com/novifinancial/x25519-dalek/compare/2cd269742922403a588af0872e3b06fe4ef89d0e...459bb04bbe7ba650f3e5c30e594542c1f7892225)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Closes: #4952
Approved by: rexhoffman

aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,libra/libra