Bump github.com/cloudflare/circl from 1.6.0 to 1.6.1 in /pkg (#509)

Bumps [github.com/cloudflare/circl](https://github.com/cloudflare/circl)
from 1.6.0 to 1.6.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/cloudflare/circl/releases">github.com/cloudflare/circl's
releases</a>.</em></p>
<blockquote>
<h2>CIRCL v1.6.1</h2>
<ul>
<li>Fixes some point checks on the FourQ curve.</li>
<li>Hybrid KEM fails on low-order points.</li>
</ul>
<h3>What's Changed</h3>
<ul>
<li>kem/hybrid: ensure X25519 hybrids fails with low order points by <a
href="https://github.com/Lekensteyn"><code>@​Lekensteyn</code></a> in <a
href="https://redirect.github.com/cloudflare/circl/pull/541">cloudflare/circl#541</a></li>
<li>.github: Use native ARM64 builders instead of QEMU by <a
href="https://github.com/Lekensteyn"><code>@​Lekensteyn</code></a> in <a
href="https://redirect.github.com/cloudflare/circl/pull/542">cloudflare/circl#542</a></li>
<li>Fixes several errors on twisted Edwards curves. by <a
href="https://github.com/armfazh"><code>@​armfazh</code></a> in <a
href="https://redirect.github.com/cloudflare/circl/pull/545">cloudflare/circl#545</a></li>
<li>Release v1.6.1 by <a
href="https://github.com/armfazh"><code>@​armfazh</code></a> in <a
href="https://redirect.github.com/cloudflare/circl/pull/546">cloudflare/circl#546</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/cloudflare/circl/compare/v1.6.0...v1.6.1">https://github.com/cloudflare/circl/compare/v1.6.0...v1.6.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cloudflare/circl/commit/c6d33e35234ebf5c4319d12ae7d77d7d17053e56"><code>c6d33e3</code></a>
Release v1.6.1</li>
<li><a
href="https://github.com/cloudflare/circl/commit/0c3868ef6fc8ce864bc4104863186afdd2947f14"><code>0c3868e</code></a>
curve4q: Shared must fail with low order points.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/9fd570dd508eef941d3f42fb94413a899b96d52e"><code>9fd570d</code></a>
curve4q: Test showing DH does not fails on identity point.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/c988ceba827fe09896e770c152646dded447903d"><code>c988ceb</code></a>
fourq: Correctly unmarshalling point.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/ef2611dcde7f6d25e31082412bbb30f2a870d133"><code>ef2611d</code></a>
fourq: Test showing point unmarshal fails.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/05eba44d1a35f979c5f3ac914bcc50c1122e8ced"><code>05eba44</code></a>
fourq: Handle the case of Z=0 for IsOnCurve and IsEqual.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/eef08780cc3cb9befa20014e65f731391103be6b"><code>eef0878</code></a>
fourq: Test showing isEqual and IsOnCurve fail.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/2298474ef688938e4a81ca14990b9a11a8677e2a"><code>2298474</code></a>
goldilocks; Handling points with z=0.</li>
<li><a
href="https://github.com/cloudflare/circl/commit/5a940a111507232035d0b753fbf3068c52d6b8ac"><code>5a940a1</code></a>
goldilocks: Test for IsEqual must fail with Z=0</li>
<li><a
href="https://github.com/cloudflare/circl/commit/48c3b6a2746a18db4d8b675ab296980514359340"><code>48c3b6a</code></a>
ed25519: Fix isEqual to handle points with Z=0.</li>
<li>Additional commits viewable in <a
href="https://github.com/cloudflare/circl/compare/v1.6.0...v1.6.1">compare
view</a></li>
</ul>
</details>
<br />


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