Update pyinstaller requirement from ~=5.3 to ~=6.1

[dependabot]

Updates the requirements on pyinstaller to permit the latest version.

Release notes

Sourced from pyinstaller's releases.

v6.1.0

Please see the v6.1.0 section of the changelog for a list of the changes since v6.0.0.

Changelog

Sourced from pyinstaller's changelog.

6.1.0 (2023-10-13)

Features

* Allow users to re-enable the old onedir layout (without contents directory) by
  settings the :option:`--contents-directory` option (or the equivalent
  ``contents_directory`` argument to ``EXE`` in the .spec file) to ``'.'``.
  (:issue:`7968`)
Bugfix

* (macOS) Prevent bootloader from clearing ``DYLD_*`` environment variables
  when running in ``onefile`` mode, in order to make behavior consistent
  with ``onedir`` mode. (:issue:`7973`)
* (Windows) Fix unintentional randomization of library search path order
  in the binary dependency analysis step. The incorrect order of search
  paths would result in defunct builds when using both ``pywin32``
  and ``PyQt5``, ``PyQt6``, ``PySide2``, or ``PySide6``, as it would prevent
  the python's copy of ``VCRUNTIME140_1.dll`` from being collected into
  the top-level application directory due to it being shadowed by the
  Qt-provided copy. Consequently, the application would fail with
  ``ImportError: DLL load failed while importing pywintypes: The specified
  module could not be found.`` (:issue:`7978`)
* Ensure that ``__main__`` is always in the list of modules to exclude,
  to prevent a program or a library that attempts to import ``__main__``
  from pulling PyInstaller itself into frozen application bundle.
  (:issue:`7956`)
* Fix :func:`PyInstaller.utils.hooks.collect_entry_point` so that it returns
  module names (without class names). This matches the behavior of previous
  PyInstaller versions that regressed in PyInstaller ``v6.0.0`` during
  transition from ``pkg_resources`` to ``importlib.metadata``. (:issue:`7958`)
* Fix ``TypeError: process_collected_binary() got an unexpected keyword
  argument 'strip'`` error when UPX compression is enabled. (:issue:`7998`)
* Validate binaries returned by analysis of ``ctypes`` calls in collected
  modules; the analysis might return files that are in ``PATH`` but are
  not binaries, which then cause errors during binary dependency analysis.
  An example of such problematic case is the ``gmsh`` package on Windows,
  where ``ctypes.util.find_library('gmsh')`` ends up resolving the python
  script called ``gmsh`` in the environment's Scripts directory.
  (:issue:`7984`)
Hooks

* Update ``PySide6.QtHttpServer`` hook for compatibility with ``PySide6``
</tr></table> 
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</details>
<details>
<summary>Commits</summary>

<ul>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/362ff1b9090748839b1d19f50c78abc79c1039b0"><code>362ff1b</code></a> Release v6.1.0. [skip ci]</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/89cb2043d390f21c556102a4e2356e45e0bb6cbc"><code>89cb204</code></a> Fix TypeError when using UPX compression.</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/e7c252573f424ad9b79169ab01229d27599004b1"><code>e7c2525</code></a> Tests: Requirements: Scheduled weekly dependency update for week 41 (<a href="https://redirect.github.com/pyinstaller/pyinstaller/issues/7993">#7993</a>)</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/90c2cf9137fedcfda6e42fc94d41cac4527b465b"><code>90c2cf9</code></a> hooks: update PySide6.QtHttpServer hook for PySide6 6.5.3</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/c1d5e6a8bcf4ee21d9d12a186dda76b0a2f7d06e"><code>c1d5e6a</code></a> docs: fix documentation for python interpreter run-time options [skip ci]</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/43f3d06bc582471fa27a484d189e3688c32a8573"><code>43f3d06</code></a> building: validate binaries returned by analysis of ctypes calls</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/73d2c0f8c17f61c7f219edd5ce2f2c90530b2e7a"><code>73d2c0f</code></a> bootloader: cleanup: make set_systemd_env() in pyi_utils static</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/ec2db2cbd2708127b291d8f7f54d0b6293986292"><code>ec2db2c</code></a> bootloader: cleanup: remove PYI_NULLCHAR</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/f09d20bfa80eb378984a92fc63cb845563f66a20"><code>f09d20b</code></a> bootloader: cleanup: replace pyi_utils_set_environment</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/5b7171663aa3dc1eec7ba3b9fe9cc1e7fe7caf43"><code>5b71716</code></a> bootloader: macOS: do not unset DYLD_* environment variables</li>
<li>Additional commits viewable in <a href="https://github.com/pyinstaller/pyinstaller/compare/v5.3...v6.1.0">compare view</a></li>
</ul>
</details>

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</code></pre>


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[dependabot]

Superseded by #317.