chore(deps): Update toml requirement from 0.8 to 0.9 (#874)

Updates the requirements on [toml](https://github.com/toml-rs/toml) to
permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/toml-rs/toml/commit/c28f9ac30f1e7f53e8c2fd27ae04bb1f7c7a394b"><code>c28f9ac</code></a>
chore: Release</li>
<li><a
href="https://github.com/toml-rs/toml/commit/f3a229914863475cf5590a5e964b44f04b852eec"><code>f3a2299</code></a>
docs: Update changelog</li>
<li><a
href="https://github.com/toml-rs/toml/commit/69f09d3093df7cbd523b81a7e8731bc64b5727ed"><code>69f09d3</code></a>
fix(lex): Don't loop over ')' for forever (<a
href="https://redirect.github.com/toml-rs/toml/issues/1003">#1003</a>)</li>
<li><a
href="https://github.com/toml-rs/toml/commit/cc68ae4f426d48eb69be9178c28440585c0c32fc"><code>cc68ae4</code></a>
fix(lex): Don't loop over ')' for forever</li>
<li><a
href="https://github.com/toml-rs/toml/commit/8c8ef44ea1264f6e3645bfe32aac6bc943b31fa2"><code>8c8ef44</code></a>
chore: Release</li>
<li><a
href="https://github.com/toml-rs/toml/commit/b60ac5bfe95974d4eb44a8c8b1421db685badec0"><code>b60ac5b</code></a>
fix(toml): Correct minimal version for indexmap (<a
href="https://redirect.github.com/toml-rs/toml/issues/998">#998</a>)</li>
<li><a
href="https://github.com/toml-rs/toml/commit/966bd405117ba4893dbdd22ce3327c9b16abc298"><code>966bd40</code></a>
fix(toml): Correct minimal version for indexmap</li>
<li><a
href="https://github.com/toml-rs/toml/commit/2ed2af651933081e868f7235c99bf52910e72137"><code>2ed2af6</code></a>
docs(readme): Mention additional crates</li>
<li><a
href="https://github.com/toml-rs/toml/commit/c7d93e5524227cc7ead57fe9c5325bf14bab1965"><code>c7d93e5</code></a>
chore: Release</li>
<li><a
href="https://github.com/toml-rs/toml/commit/1ac3aa136cd9a4175dba25b471b512e374529103"><code>1ac3aa1</code></a>
chore: Release</li>
<li>Additional commits viewable in <a
href="https://github.com/toml-rs/toml/compare/toml-v0.8.0...toml-v0.9.2">compare
view</a></li>
</ul>
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