Upgrade PyQt5, increases Python version compatibility

[carlosperate]

To be merged after we releases 1.2.x.
As this drops compatibility with macOs 10.12 Sierra, and older Python releases, this could probably be released as v1.3.0.

Locking PyQt5 to version 5.15.10 instead of the latest 5.15.11 release, because 5.15.11 jumps from macOS 10.13 to 11 , dropping 3 major macOS releases.

	Before	After
Qt version	5.13	5.15.10
Python versions	3.5 to 3.8	3.7 to 3.13
min macOS support	10.12 Sierra	10.13 High Sierra
macOS arm64 support	❌	✅ *1
Pi OS support	Stretch, Buster	Buster, Bullseye, Bookworm*2
Ubuntu LTS support	16.04+	20.04+ *3
Windows support	7+	7+

*1 In theory this should work, but haven't got access to an arm mac to test, CI on arm64 mac does pass
*2 Not tested yet in Bookworm
*3 Ubuntu 18.04 supported by Qt 5.15, but it ships Python 3.6, which is not supported by PyQt5 5.15.7+

[carlosperate]

While running the Bullseye CI, sotimes this exception is encountered:
https://pipelinesghubeus23.actions.githubusercontent.com/WEHCO7BLxX43VZ6LAsmLv9N4egiAnfJmgg7HuAR6Qh3z6PEs6u/_apis/pipelines/1/runs/3215/signedlogcontent/5?urlExpires=2024-01-12T18%3A57%3A13.4527598Z&urlSigningMethod=HMACV1&urlSignature=XnYX3x4I8MrHMeE6mcxq%2BF0vGuaAQoU%2F%2FCBzPrSnivE%3D

err: All done! ✨ 🍰 ✨
err: 1 file would be left unchanged.
err: Exception in thread Thread-1:
err: Traceback (most recent call last):
err:   File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
err:     self.run()
err:   File "/usr/lib/python3.9/concurrent/futures/process.py", line 317, in run
err:     result_item, is_broken, cause = self.wait_result_broken_or_wakeup()
err:   File "/usr/lib/python3.9/concurrent/futures/process.py", line 376, in wait_result_broken_or_wakeup
err:     worker_sentinels = [p.sentinel for p in self.processes.values()]
err:   File "/usr/lib/python3.9/concurrent/futures/process.py", line 376, in <listcomp>
err:     worker_sentinels = [p.sentinel for p in self.processes.values()]
err: RuntimeError: dictionary changed size during iteration

But this turns out to be an issue in the Python standard library:
https://bugs.python.org/issue43498

All Bullseye releases ship 3.9.2 and the issue is resolved in 3.9.10:
python/cpython#29837
https://peps.python.org/pep-0596/

Restarting the CI job is likely to "workaround" the issue.

[JeongJun-Lee]

In Windows 10, if you press the REPL button in Python mode, you can see the error below:

2025-02-13 15:04:14,915 - traitlets:653(_create_connected_socket) DEBUG: Connecting to: tcp://127.0.0.1:62730
2025-02-13 15:04:14,931 - root:175(excepthook) ERROR: Unrecoverable error
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Mu Editor Custom\Python\lib\site-packages\mu\modes\python3.py", line 372, in on_kernel_start
    self.view.add_jupyter_repl(kernel_manager, kernel_client)
  File "C:\Users\user\AppData\Local\Programs\Mu Editor Custom\Python\lib\site-packages\mu\interface\main.py", line 716, in add_jupyter_repl
    kernel_manager.kernel.gui = "qt4"
AttributeError: 'NoneType' object has no attribute 'gui'

[carlosperate]

Thanks for testing @JeongJun-Lee!
If you go back to the main branch, does the iPython REPL work correctly?