Test across Python 3.8 or later in GitHub Actions workflow

[jptomoya]

Test across Python 3.8 or later in GitHub Actions workflow

What's this Pull Request for?

Choose one or more of the following items.

• Bug fix
• Add/Remove feature
• Cleaning code (including optimization/typo fix)
• Others

Please explain the detail here:
Testing across Python versions 3.8 to 3.12 in the GitHub Actions workflow to identify version-specific issues.
Notably, warnings have been observed in Python 3.12 (see build (3.12) summary):

/home/runner/work/ptrlib/ptrlib/ptrlib/arch/intel/disassembler.py:65: SyntaxWarning: invalid escape sequence '\s'
  op = re.sub("\s+", " ", op.strip())
/home/runner/work/ptrlib/ptrlib/ptrlib/arch/arm/disassembler.py:70: SyntaxWarning: invalid escape sequence '\s'
  op = re.sub("\s+", " ", op.strip())

Also fixed Node.js 16 actions deprecated warnings.

What have you done so far?

Tell me what you've tested to assure your change is right.

• All tests passed on your machine (python -m unittest)
• Added test cases for new feature
• Nothing / Test not required

(It's not mandatory to check even one of them, but test cases make it easy for the author to review your PR.)

Comment

You can view the pytest results on the job summary page :)

[ptr-yudai]

LGTM!