Fix skip_missing_interpreters with package=wheel

[gpotter2]

skip_missing_interpreters is broken when using package=wheel.

To reproduce

tox.ini

[tox]
skip_missing_interpreters = true
envlist = py{37,38,39,310,311,312}

[testenv]
package = wheel
allowlist_externals = echo
commands =
  echo "hey"

Note

This issue was basically already reported in #2811 under a slight different variation. I'm worried that there are still 30 other badly-tested edge cases where skip_missing_interpreters breaks.

Checks

• ran the linter to address style issues (tox -e fix)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[gpotter2]

Why. So it's normal for depends to show could not find python interpreter with spec(s): py31) even if skip_missing_interpreters=true. I don't understand this test so I'm giving up on fixing it myself.

See #3153