742: Bump num-bigint from 0.3.1 to 0.4.0 r=collinc97 a=dependabot-preview[bot]
Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.3.1 to 0.4.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-num/num-bigint/blob/master/RELEASES.md">num-bigint's changelog</a>.</em></p>
<blockquote>
<h1>Release 0.4.0 (2021-03-05)</h1>
<h3>Breaking Changes</h3>
<ul>
<li>Updated public dependences on <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/194">arbitrary, quickcheck</a>, and <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/185">rand</a>:
<ul>
<li><code>arbitrary</code> support has been updated to 1.0, requiring Rust 1.40.</li>
<li><code>quickcheck</code> support has been updated to 1.0, requiring Rust 1.46.</li>
<li><code>rand</code> support has been updated to 0.8, requiring Rust 1.36.</li>
</ul>
</li>
<li><a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/195"><code>Debug</code> now shows plain numeric values for <code>BigInt</code> and <code>BigUint</code></a>,
rather than the raw list of internal digits.</li>
</ul>
<p><strong>Contributors</strong>: <a href="https://github.com/cuviper"><code>@cuviper</code></a>, <a href="https://github.com/Gelbpunkt"><code>@Gelbpunkt</code></a></p>
<h1>Release 0.3.2 (2021-03-04)</h1>
<ul>
<li><a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/175">The new <code>BigUint</code> methods <code>count_ones</code> and <code>trailing_ones</code></a> return the
number of <code>1</code> bits in the entire value or just its least-significant tail,
respectively.</li>
<li><a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/183">The new <code>BigInt</code> and <code>BigUint</code> methods <code>bit</code> and <code>set_bit</code></a> will read
and write individual bits of the value. For negative <code>BigInt</code>, bits are
determined as if they were in the two's complement representation.</li>
<li><a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/187">The <code>from_radix_le</code> and <code>from_radix_be</code> methods</a> now accept empty
buffers to represent zero.</li>
<li><a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/192"><code>BigInt</code> and <code>BigUint</code> can now iterate digits as <code>u32</code> or <code>u64</code></a>,
regardless of the actual internal digit size.</li>
</ul>
<p><strong>Contributors</strong>: <a href="https://github.com/BartMassey"><code>@BartMassey</code></a>, <a href="https://github.com/cuviper"><code>@cuviper</code></a>, <a href="https://github.com/janmarthedal"><code>@janmarthedal</code></a>, <a href="https://github.com/sebastianv89"><code>@sebastianv89</code></a>, <a href="https://github.com/Speedy37"><code>@Speedy37</code></a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="d1e4498cbc"><code>d1e4498</code></a> Merge <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/issues/197">#197</a></li>
<li><a href="4b7c9d78c5"><code>4b7c9d7</code></a> Fix clippy::needless_range_loop</li>
<li><a href="a49c0acc48"><code>a49c0ac</code></a> Release 0.4.0</li>
<li><a href="7c40fded5d"><code>7c40fde</code></a> Merge <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/issues/194">#194</a> <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/issues/195">#195</a></li>
<li><a href="96cf255572"><code>96cf255</code></a> Update to arbitrary-1 and quickcheck-1</li>
<li><a href="60637c55c3"><code>60637c5</code></a> Merge <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/issues/185">#185</a></li>
<li><a href="4247abe601"><code>4247abe</code></a> implement xorshift* for benchmarking</li>
<li><a href="998d4cb559"><code>998d4cb</code></a> seed tests with u64 for platform consistency</li>
<li><a href="46aa21283a"><code>46aa212</code></a> Bump to 0.4.0-pre</li>
<li><a href="63a89672f6"><code>63a8967</code></a> Update for rand's MSRV 1.36</li>
<li>Additional commits viewable in <a href="https://github.com/rust-num/num-bigint/compare/num-bigint-0.3.1...num-bigint-0.4.0">compare view</a></li>
</ul>
</details>
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732: Bumps snarkVM to v0.2.0 r=collinc97 a=howardwu
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## Motivation
Bumps snarkVM to v0.2.0
Co-authored-by: howardwu <howardwu@berkeley.edu>
