Bump siphasher from 0.3.10 to 1.0.0 in /packages/prelude/ffi (#2112)

Bumps [siphasher](https://github.com/jedisct1/rust-siphash) from 0.3.10
to 1.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/8a5f72f36880b2f2164a90f4608d192e6de0ad1f"><code>8a5f72f</code></a>
It's been a while, let's move to 1.0,0</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/55ff379462517d8ec790bd9ce5382d2a1c364ee0"><code>55ff379</code></a>
Update .gitignore</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/acc6986bfac7ed27c66743d02409027af7111ab8"><code>acc6986</code></a>
Bump</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/da78da5eed41b6ca4f6df2f8fcbb8a0dadad59bc"><code>da78da5</code></a>
Inline</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/07b760000b4916ead1040847177a1ca53bdb6611"><code>07b7600</code></a>
Add a simple API, document caveats of hash::Hasher</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/2e4896cc7ca45ddba63301de73c377bdf9db1d50"><code>2e4896c</code></a>
Revert &quot;Hasher::write_u*() are expected keep the native
endianness&quot;</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/0159101113558bf74700cee42e18881ea3ea3e46"><code>0159101</code></a>
The 'serde' feature is apparently just for serializing the state</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/0cefc423178e3dc163bb19139d07402c0e9edbab"><code>0cefc42</code></a>
Format</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/750454ba4fcd486a1d39b12c00bdd8902c50bf87"><code>750454b</code></a>
Document that the write_u*() functions are unsafe</li>
<li><a
href="https://github.com/jedisct1/rust-siphash/commit/7118362bc9e04f07874fe22c0829a985e15e8e85"><code>7118362</code></a>
Add a userless test</li>
<li>Additional commits viewable in <a
href="https://github.com/jedisct1/rust-siphash/compare/0.3.10...1.0.0">compare
view</a></li>
</ul>
</details>
<br />


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packages/prelude/ffi/Cargo.toml

@@ -10,4 +10,4 @@ crate-type = ["staticlib"]
 
 [dependencies]
 ffi = { package = "pen-ffi", "version" = "*" }
-siphasher = "0.3"
+siphasher = "1.0"