build(deps): update jsonfeed-util requirement from <1.1.4,>=1.1.2 to >=1.1.2,<1.2.1 (#358)

Updates the requirements on
[jsonfeed-util](https://github.com/lukasschwab/jsonfeed) to permit the
latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/lukasschwab/jsonfeed/releases">jsonfeed-util's
releases</a>.</em></p>
<blockquote>
<h2>1.2.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Reintroduce Python 3.9 support by <a
href="https://github.com/lukasschwab"><code>@​lukasschwab</code></a> in
<a
href="https://redirect.github.com/lukasschwab/jsonfeed/pull/16">lukasschwab/jsonfeed#16</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/lukasschwab/jsonfeed/compare/1.1.4...1.2.0">https://github.com/lukasschwab/jsonfeed/compare/1.1.4...1.2.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/fe24bc40c2d14e2d33f3dc8681a2795e3821c8f7"><code>fe24bc4</code></a>
Bump version to 1.2.0 for release</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/8815aee76545a8689656680daf7b91ecdb35295e"><code>8815aee</code></a>
Upgrade actions/upload-pages-artifact: v1→v3</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/966ba9f7f970bb43a57f27b6ea53c60a062d6af2"><code>966ba9f</code></a>
Formalize Python 3.9...3.13 support (<a
href="https://redirect.github.com/lukasschwab/jsonfeed/issues/16">#16</a>)</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/fb1dfe35db1486cc0b56e2c5bea97874c0a2cf02"><code>fb1dfe3</code></a>
Lint and style <a
href="https://redirect.github.com/lukasschwab/jsonfeed/issues/14">#14</a></li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/ad1f34e420d6641f312f1db4ff79afb107ab4587"><code>ad1f34e</code></a>
Eliminate default list reuse in <code>Feed</code> constructor (<a
href="https://redirect.github.com/lukasschwab/jsonfeed/issues/14">#14</a>)</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/4593ad1e002bf35805496fc55184198c6dffe1d2"><code>4593ad1</code></a>
Add missing paren to usage example</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/aa5e3c9bd40ad65faf09c76088aa25ff539bd773"><code>aa5e3c9</code></a>
Bump version to 1.1.3 for release</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/4b99f87d7f8e29752fbe478d3e40b22b4a2c1201"><code>4b99f87</code></a>
Fix documentation generation (<a
href="https://redirect.github.com/lukasschwab/jsonfeed/issues/12">#12</a>)</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/f9584075e05744c063448852797170a12cf4033c"><code>f958407</code></a>
Fix README reference to workflow: s/yml/yaml</li>
<li><a
href="https://github.com/lukasschwab/jsonfeed/commit/95aa54afca769391496b4bd84952b13b2d6fe305"><code>95aa54a</code></a>
Remove 3.7 from test grid</li>
<li>Additional commits viewable in <a
href="https://github.com/lukasschwab/jsonfeed/compare/1.1.2...1.2.0">compare
view</a></li>
</ul>
</details>
<br />

<details>
<summary>Most Recent Ignore Conditions Applied to This Pull
Request</summary>

| Dependency Name | Ignore Conditions |
| --- | --- |
| jsonfeed-util | [< 1.2, > 1.1.2] |
</details>


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</details>

Author: Guts

requirements/testing.txt

@@ -4,7 +4,7 @@
 # -------
 
 feedparser>=6.0.11,<6.1
-jsonfeed-util>=1.1.2,<1.1.4
+jsonfeed-util>=1.1.2,<1.2.1
 mkdocs-material[imaging]>=9.5.47
 pytest-cov>=6,<7
 validator-collection>=1.5,<1.6