Update the "Disassemble Check" test

[jpivarski]

Vector Version

HEAD

Python Version

3.8.8

OS / Environment

GitHub Actions

Describe the bug

I ran the CI test suite on main to make sure that Awkward/Uproot updates aren't breaking anything. (I also made the—unchecked—assumption that CI is testing against Awkward and Uproot pre-releases. I'll have to check that as well.)

Anyway, the "Disassemble Check" failed. That one was pinned to a Python minor version (3.8) because it involves Python byte code. That's less scary than it sounds because this test is mostly checking expressions, and changes in expression byte code is minimal. Updating it will be a matter of getting a newer version of uncompyle6 (it now works with Pythons 3.9 and 3.10) and maybe making a small change to the test.

Steps to Reproduce

Run CI.

Expected Results

CI should not fail.

Observed Results

CI failed.

Relevant log output

https://github.com/scikit-hep/vector/actions/runs/3634233305/jobs/6132119346

Run actions/setup-python@v4
  with:
    python-version: [3](https://github.com/scikit-hep/vector/actions/runs/3634233305/jobs/6132119346#step:3:3).8.8
    check-latest: false
    token: ***
    update-environment: true
Version 3.8.8 was not found in the local cache
Error: Version 3.8.8 with arch x6[4](https://github.com/scikit-hep/vector/actions/runs/3634233305/jobs/6132119346#step:3:4) not found
The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

[Saransh-cpp]

Vector is currently only tested on awkward v1's ._v2.

A PR is open for v2 support (reviewed by @agoose77!) - #284. I re-ran the tests on this PR and they pass with rc6 - https://github.com/scikit-hep/vector/actions/runs/3506891827/jobs/6138148137.

I wanted to discuss a couple of points before merging the v2 support PR - #284 (comment).

Also, I see the issue template has some redundant fields. I'll trim it down.