[`flake8-use-pathlib`] Extend check for invalid path suffix to include the case `"."` (`PTH210`) #37246

Job	Run time
cargo build (release)	0s
Determine changes	9s
cargo fmt	17s
mkdocs	2m 40s
pre-commit	39s
python package	1m 18s
cargo clippy	1m 52s
benchmarks	4m 56s
cargo build (msrv)	4m 6s
cargo fuzz build	0s
cargo shear	29s
cargo test (linux)	1m 50s
cargo test (linux, release)	3m 38s
cargo test (wasm)	1m 26s
cargo test (windows)	4m 16s
test scripts	54s
formatter instabilities and black similarity	0s
test ruff-lsp	43s
ecosystem	2m 35s
fuzz parser	0s
	31m 48s

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