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Merge rust-bitcoin/rust-bitcoin#2576: Return error when constructing pubkey from slice

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/<a class="double-link" href="https://git"><a class=hub.com/rust-bitcoin/rust-bitcoin/commit/6ecc41d126621862fe2392c7ab510e2ef9ecc960">6ecc41d12 Return error when constructing pubkey from slice (Tobin C. Harding)

Pull request description:

  This PR fixes a bug introduced by me in #2473, and uncovered by #2563 - amazing that it was found so quickly!

  Constructing a pubkey using `PublicKey::from_slice` can fail for reasons other than just incorrect length - we should not be using `expect` but rather returning the error.

  A purist might argue that we are now returning a nested error type with an unreachable variant:

    `ParsePublicKeyError::Encoding(FromSliceError::InvalidLength)`

  Is this acceptable or do we want to further improve this?

ACKs for top commit:
  sanket1729:
    ACK 6ecc41d126621862fe2392c7ab510e2ef9ecc960
  apoelstra:
    ACK 6ecc41d126621862fe2392c7ab510e2ef9ecc960

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