Update prost requirement from 0.11 to 0.12 (risc0#837)

Updates the requirements on [prost](https://github.com/tokio-rs/prost)
to permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tokio-rs/prost/commit/10582c2f674a1f4618e9fb8d380081136340ac84"><code>10582c2</code></a>
release 0.12.0</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/7ce9b9756ba1ca0c6228931e2a9ff7859931ac95"><code>7ce9b97</code></a>
feat: <code>Name</code> trait + <code>Any</code> encoding support (<a
href="https://redirect.github.com/tokio-rs/prost/issues/896">#896</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/f9a3cfff07536a412e4f96f5ea3749c52c50170f"><code>f9a3cff</code></a>
Make Debug impl optional for types (<a
href="https://redirect.github.com/tokio-rs/prost/issues/797">#797</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/6180f9fa3a93e42572633cb0b0610dcb0690c508"><code>6180f9f</code></a>
docs: fix protoc install link (<a
href="https://redirect.github.com/tokio-rs/prost/issues/900">#900</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/1d7405803004e85f58511af2a439460b4237a0e2"><code>1d74058</code></a>
prost-build: do not escape brackets followed by parenthesis in comments
(<a
href="https://redirect.github.com/tokio-rs/prost/issues/851">#851</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/413b0299e0d0e73b6085ad9b897fb7ec7e63cb2a"><code>413b029</code></a>
chore: Bump MSRV to 1.64 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/902">#902</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/ca73cbe4bbcbdb4f3d30455a090ff50209dc1fc3"><code>ca73cbe</code></a>
feat: add TryFrom&lt;i32&gt; implementation to Enumeration (<a
href="https://redirect.github.com/tokio-rs/prost/issues/853">#853</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/9c877ce32ec0c465e437144c1bf4a27cb3aa705c"><code>9c877ce</code></a>
chore: Update ci (<a
href="https://redirect.github.com/tokio-rs/prost/issues/854">#854</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/65451cc4cbffaca578de1a8f4a218cca2ec1c9ac"><code>65451cc</code></a>
Fix <code>non_snake_case</code> warning on generated identity functions
(<a
href="https://redirect.github.com/tokio-rs/prost/issues/891">#891</a>)</li>
<li><a
href="https://github.com/tokio-rs/prost/commit/80fb9d18b7af2c82a8f54fb6c9e7ccfa4d5629ce"><code>80fb9d1</code></a>
release 0.11.9 (<a
href="https://redirect.github.com/tokio-rs/prost/issues/842">#842</a>)
(<a
href="https://redirect.github.com/tokio-rs/prost/issues/895">#895</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/tokio-rs/prost/compare/prost-build-0.11.1...v0.12.0">compare
view</a></li>
</ul>
</details>
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risc0/zkvm/Cargo.toml

@@ -64,7 +64,7 @@ crypto-bigint = { version = "0.5", default-features = false, features = [
 ], optional = true }
 num-derive = "0.4"
 num-traits = { version = "0.2", default-features = false, optional = true }
-prost = { version = "0.11", optional = true }
+prost = { version = "0.12", optional = true }
 rand = { version = "0.8", optional = true }
 rayon = { version = "1.5", optional = true }
 rrs-lib = { version = "0.1", optional = true }