fix: use socket bind to get allowed port

[horw]

While running the test, we encountered a conflict with port allocation. The current PR is an attempt to resolve this issue.

[horw]

One of the solutions I think we can use is port 0. There are a few ways to implement this:

• Use a socket and assign port 0, then release it for use in another process.
• Another solution is to make QEMU allocate a port by itself with the format -qmp tcp:127.0.0.1:0,server,wait=off. However, to obtain this port, we need to install an additional package, such as psutil.

So I chose the first solution, as I don't believe there is a very high probability of a port allocation error.

[hfudev]

Thank you. LGTM. Let's fix the ci problems first.

[horw]

Thank you. LGTM. Let's fix the ci problems first.

I have taken a look at this problem:

• Our architecture is armv7l, and the Python version is 3.7.
• The cryptography's newest version is not compatible with our environment.
• So, I have decided to use a fixed version and set it to 40.0.1 only for arm.

[hfudev]

Thank you!