Bump pyinstaller from 6.20.0 to 6.21.0

[dependabot]

Bumps pyinstaller from 6.20.0 to 6.21.0.

Release notes

Sourced from pyinstaller's releases.

v6.21.0

Please see the v6.21.0 section of the changelog for a list of the changes since v6.20.0.

Changelog

Sourced from pyinstaller's changelog.

Changelog for PyInstaller

.. NOTE:

You should NOT be adding new change log entries to this file, this file is managed by towncrier. You may edit previous change logs to fix problems like typo corrections or such.

To add a new change log entry, please see https://pyinstaller.readthedocs.io/en/latest/development/changelog-entries.html

.. Preview unreleased news fragments. .. towncrier-draft-entries:: The Next Release

.. towncrier release notes start

6.16.0 (2026-06-13)

Features

* Add support for Python 3.15. (:issue:`9456`)
* Initial support for setting :ref:`alternative splash screen centering modes
  <splash screen centering>` for multi-monitor setups. (:issue:`6271`)
Hooks

* Prevent ``_ios_support`` and ``libobjc.so`` from being collected on non-IOS
  platforms if :mod:`webbrowser` is imported. (:issue:`9436`)
* Update ``scipy`` hook for compatibility with upcoming ``scipy`` v1.18.0.
  (:issue:`9450`)
* Update the ``gi.repository.Adw`` hook to collect translation files
  for ``libadwaita``. (:issue:`9444`)
Documentation

</code></pre>

<ul>

<li>Document known issues with using splash screen in <code>onedir</code> GUI-based

applications. (:issue:<code>9425</code>)</li>

<li>Document the &quot;glowing magenta border&quot; problem in splash screen when

splash screen image contains semi-transparent pixels (for example,

due to feathered edges). (:issue:<code>9425</code>)</li>

</ul>

</blockquote>

</details>

<details>

<summary>Commits</summary>
<ul>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/1cda34561015a90b6e1ae31dc89703799adaf13e&quot;&gt;&lt;code&gt;1cda345&lt;/code&gt;&lt;/a> Release v6.21.0. [skip ci]</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/14b6af36cd7284360e7094e66e97ddef76412876&quot;&gt;&lt;code&gt;14b6af3&lt;/code&gt;&lt;/a> tests: use different module in TestModuleGraph::test_find_module</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/6041ae39584fbb0606c1f936e33e656c075859a8&quot;&gt;&lt;code&gt;6041ae3&lt;/code&gt;&lt;/a> tests: modulegraph: skip tests that are incompatible with python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/dd3c5601e58fa3b7993486d5bd9f769653f6ee24&quot;&gt;&lt;code&gt;dd3c560&lt;/code&gt;&lt;/a> tests: adjust bytecode sanity-check tests for python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/08f4d82600302727dfc210ec38aa9eeebaf7a671&quot;&gt;&lt;code&gt;08f4d82&lt;/code&gt;&lt;/a> modulegraph: adapt _scan_bytecode() for changes in python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/13c2e638918528e7b15b7f048aa01d6de9fe9b50&quot;&gt;&lt;code&gt;13c2e63&lt;/code&gt;&lt;/a> modulegraph: improve assert messages in _scan_bytecode()</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/d4fd4f442a214a656e4fc690f86e998d08d46bcb&quot;&gt;&lt;code&gt;d4fd4f4&lt;/code&gt;&lt;/a> depend: bytecode: add support for LOAD_COMMON_CONSTANT</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/5a9f21030ed91f7dc394a24c4e660c742ad6bf07&quot;&gt;&lt;code&gt;5a9f210&lt;/code&gt;&lt;/a> bootstrap: fix issues caused by encodings being frozen in python 3.15</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/8d97d35a2c04162be04a33748318308e09d398a4&quot;&gt;&lt;code&gt;8d97d35&lt;/code&gt;&lt;/a> tests: test_spec_options: explicitly disable argparse colored output</li>

<li><a href="https://github.com/pyinstaller/pyinstaller/commit/10d0772984f885246d002a7963c728c118639225&quot;&gt;&lt;code&gt;10d0772&lt;/code&gt;&lt;/a> tests: use can_import_module('tkinter') with all tkinter/splash tests</li>

<li>Additional commits viewable in <a href="https://github.com/pyinstaller/pyinstaller/compare/v6.20.0...v6.21.0&quot;&gt;compare view</a></li>

</ul>

</details>
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