chore(deps): Bump openssl from 0.10.55 to 0.10.56 (#796)

Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.55
to 0.10.56.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/7daab5b97c387d8fad8d0b054d5b521fe60d57c8"><code>7daab5b</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/2009">#2009</a>
from reaperhulk/changelog</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/12ee78d277e4f986ff7da5572d42059810b0f8e3"><code>12ee78d</code></a>
changelog and version bump</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/0008d1296f628df379769505dc1ea9b33044a716"><code>0008d12</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/2008">#2008</a>
from alex/deref-cipher</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/8449b822854e29213756ad339abbfb833a73216e"><code>8449b82</code></a>
Implement Deref[Mut] for Cipher on older OpenSSLs</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/b1ee513fd164ae7267cfc15e7e9e8bb6f9767600"><code>b1ee513</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/2005">#2005</a>
from sfackler/sfackler-patch-1</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/ee4c126f89c31367c5ee202bd98ae5a99a9b8df5"><code>ee4c126</code></a>
bump ci versions</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/0a348767cf2961ffe821a9fe9ebbec73a66bdc09"><code>0a34876</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/1998">#1998</a>
from trail-of-forks/poly1305-bindings</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/e1fd4da2448899bf36aa933b533d899a828590ec"><code>e1fd4da</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/2002">#2002</a>
from davidben/no-sock</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/c8b6077ca8b0d741383abcd1586d3ba4bbbaadd5"><code>c8b6077</code></a>
Gate BIO_new_socket in OPENSSL_NO_SOCK in handwritten bindings</li>
<li><a
href="https://github.com/sfackler/rust-openssl/commit/99bce5b312ed6678bae21f7f86afae4b7be6db68"><code>99bce5b</code></a>
Merge pull request <a
href="https://redirect.github.com/sfackler/rust-openssl/issues/2000">#2000</a>
from zh-jq/ec_point_to_hex_str</li>
<li>Additional commits viewable in <a
href="https://github.com/sfackler/rust-openssl/compare/openssl-v0.10.55...openssl-v0.10.56">compare
view</a></li>
</ul>
</details>
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