Consider with blocks as single-item branches

[charliermarsh]

Summary

Ensures that, e.g., the following is not considered a redefinition-without-use:

import contextlib

foo = None
with contextlib.suppress(ImportError):
    from some_module import foo

Closes #12309.

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check detected linter changes. (+1 -4 violations, +0 -0 fixes in 4 projects; 50 projects unchanged)

fronzbot/blinkpy (+0 -2 violations, +0 -0 fixes)

- blinksync/blinksync.py:58:53: F811 Redefinition of unused `working` from line 55
- blinksync/blinksync.py:81:53: F811 Redefinition of unused `working` from line 78

prefecthq/prefect (+0 -1 violations, +0 -0 fixes)

- src/prefect/cli/cloud/__init__.py:266:42: F811 Redefinition of unused `timeout_scope` from line 241

encode/httpx (+0 -1 violations, +0 -0 fixes)

- tests/client/test_auth.py:371:73: F811 Redefinition of unused `client` from line 366

mesonbuild/meson-python (+1 -0 violations, +0 -0 fixes)

+ tests/test_editable.py:287:30: RUF100 [*] Unused `noqa` directive (unused: `F811`)

Changes by rule (2 rules affected)

code	total	+ violation	- violation	+ fix	- fix
F811	4	0	4	0	0
RUF100	1	1	0	0	0

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+1 -4 violations, +0 -0 fixes in 4 projects; 50 projects unchanged)

fronzbot/blinkpy (+0 -2 violations, +0 -0 fixes)

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

- blinksync/blinksync.py:58:53: F811 Redefinition of unused `working` from line 55
- blinksync/blinksync.py:81:53: F811 Redefinition of unused `working` from line 78

prefecthq/prefect (+0 -1 violations, +0 -0 fixes)

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

- src/prefect/cli/cloud/__init__.py:266:42: F811 Redefinition of unused `timeout_scope` from line 241

encode/httpx (+0 -1 violations, +0 -0 fixes)

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

- tests/client/test_auth.py:371:73: F811 Redefinition of unused `client` from line 366

mesonbuild/meson-python (+1 -0 violations, +0 -0 fixes)

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

+ tests/test_editable.py:287:30: RUF100 [*] Unused `noqa` directive (unused: `F811`)

Changes by rule (2 rules affected)

code	total	+ violation	- violation	+ fix	- fix
F811	4	0	4	0	0
RUF100	1	1	0	0	0

[charliermarsh]

Ecosystem checks are generally improvements. This one is debatable though.