[refurb] Fix FURB103 autofix

[chirizxc]

Summary

Fixes #21381

Test Plan

cargo nextest run furb103

[astral-sh-bot]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

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

astropy/astropy (+1 -1 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ astropy/io/fits/tests/test_hdulist.py:1130:14: FURB103 [*] `open` and `write` should be replaced by `Path(filename)....`
- astropy/io/fits/tests/test_hdulist.py:1130:14: FURB103 [*] `open` and `write` should be replaced by `Path(filename).write_text("Ceçi ne marche pas", encoding="utf=8")`

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
FURB103	2	1	1	0	0