[pylint] Do not trigger PLR6201 on empty collections

[JelleZijlstra]

Fixes #15729.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+0 -2 violations, +0 -0 fixes in 1 projects; 54 projects unchanged)

zulip/zulip (+0 -2 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --no-fix --output-format concise --preview --select ALL

- tools/lib/provision.py:152:42: PLR6201 Use a set literal when testing for membership
- tools/lib/provision.py:152:87: PLR6201 Use a set literal when testing for membership

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
PLR6201	2	0	2	0	0

[dylwil3]

LGTM! Thank you!

I also agree with you that if someone writes 1 in [] it's probably an error, but this isn't the right rule to describe the error...