chore(deps): update portgraph requirement from 0.8 to 0.9 (#97)

Updates the requirements on
[portgraph](https://github.com/CQCL/portgraph) to permit the latest
version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/CQCL/portgraph/blob/main/CHANGELOG.md">portgraph's
changelog</a>.</em></p>
<blockquote>
<h2>v0.9.0 (2023-09-05)</h2>
<h3>Features</h3>
<ul>
<li>Require Clone instead of Copy in ConvexChecker, add
<code>Copy</code> to filters (<a
href="https://github.com/CQCL/portgraph/issues/104">#104</a>)</li>
<li>Allow non-references in the portgraph wrappers (<a
href="https://github.com/CQCL/portgraph/issues/105">#105</a>)</li>
</ul>
<h2>v0.8.0 (2023-08-08)</h2>
<h3>Added</h3>
<ul>
<li><code>view::FilteredGraph</code> for filtering both nodes and links
of a graph (<a
href="https://github.com/CQCL/portgraph/issues/100">#100</a>[])</li>
<li><code>view::SubGraph</code> for views into non-hierarchical
subgraphs (<a
href="https://github.com/CQCL/portgraph/issues/100">#100</a>[])</li>
</ul>
<h3>Changed</h3>
<ul>
<li>
<p><code>view::NodeFiltered</code> is now a specialized version of
<code>view::FilteredGraph</code>.
Its constructor has been renamed to
<code>NodeFiltered::new_node_filtered</code>. (<a
href="https://github.com/CQCL/portgraph/issues/100">#100</a>[])</p>
<p><a
href="https://github.com/CQCL/portgraph/issues/100">#100</a>:
<a
href="https://github.com/CQCL/portgraph/issues/100">CQCL/portgraph#100</a></p>
</li>
</ul>
<h2>v0.7.2 (2023-07-31)</h2>
<h3>Added</h3>
<ul>
<li><code>algorithms::ConvexChecker</code> to check convexity property
of subgraphs of <code>LinkView</code>s (<a
href="https://github.com/CQCL/portgraph/issues/97">#97</a>[])</li>
</ul>
<h3>Changed</h3>
<ul>
<li>
<p>References to <code>PortView</code>s and <code>LinkView</code>s also
implement the traits (<a
href="https://github.com/CQCL/portgraph/issues/94">#94</a>[])</p>
</li>
<li>
<p><code>Toposort</code> now works with any <code>LinkView</code> object
(<a
href="https://github.com/CQCL/portgraph/issues/96">#96</a>[])</p>
<p><a
href="https://github.com/CQCL/portgraph/issues/94">#94</a>: <a
href="https://github.com/CQCL/portgraph/issues/94">CQCL/portgraph#94</a>
<a href="https://github.com/CQCL/portgraph/issues/96">#96</a>:
<a
href="https://github.com/CQCL/portgraph/issues/96">CQCL/portgraph#96</a>
<a href="https://github.com/CQCL/portgraph/issues/97">#97</a>:
<a
href="https://github.com/CQCL/portgraph/issues/97">CQCL/portgraph#97</a></p>
</li>
</ul>
<h2>v0.7.1 (2023-07-13)</h2>
<h3>Fixed</h3>
<ul>
<li>
<p>Only yield output neighbours in petgraph's IntoNeighbors trait
implementation (<a
href="https://github.com/CQCL/portgraph/issues/88">#88</a>[])</p>
</li>
<li>
<p>Fix incorrect dot rendering of the hierarchy for flat filtered
regions (<a
href="https://github.com/CQCL/portgraph/issues/91">#91</a>[])</p>
<p><a
href="https://github.com/CQCL/portgraph/issues/88">#88</a>: <a
href="https://github.com/CQCL/portgraph/issues/88">CQCL/portgraph#88</a>
<a href="https://github.com/CQCL/portgraph/issues/91">#91</a>:
<a
href="https://github.com/CQCL/portgraph/issues/91">CQCL/portgraph#91</a></p>
</li>
</ul>
<h2>v0.7.0 (2023-06-28)</h2>
<h3>Added</h3>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/CQCL/portgraph/commits">compare view</a></li>
</ul>
</details>
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Cargo.toml

@@ -70,6 +70,6 @@ members = ["pyrs", "compile-matcher"]
 [workspace.dependencies]
 
 quantinuum-hugr = { git = "https://github.com/CQCL-DEV/hugr", rev = "5a97a635" }
-portgraph = { version = "0.8", features = ["serde"] }
+portgraph = { version = "0.9", features = ["serde"] }
 pyo3 = { version = "0.19" }
 itertools = { version = "0.11.0" }