fix: skip non-ASCII path tests when locale lacks UTF-8 support

[LeonidasZhak]

What

Four tests in test-path.R use Unicode characters in tempfile() patterns but fail on systems where the locale is C (no UTF-8 support), because tempfile() cannot translate the patterns to the native encoding.

This PR adds skip_if(!l10n_info()$UTF-8) guards to these tests:

• can read file w/o final newline, w/ multi-byte characters in path
• can read file w/ final newline, w/ multi-byte characters in path
• can write to path with non-ascii characters
• can read fwf file w/ non-ascii characters in path

Also updates _snaps/path.md to match current lifecycle 1.0.5.9000 wording (in vroom 1.5.0 instead of as of vroom 1.5.0).

Why

On macOS (and other systems) with LANG=C or LC_CTYPE=C, these tests fail with:

unable to translate 'no-trailing-nèwline-mülti-byté-path-' to native encoding

The sibling test at line 184 already has a locale guard (skip_if(l10n_info()$Latin-1)), but the four affected tests had none.

Validation

Rscript -e 'devtools::test()'
# FAIL 0 | WARN 0 | SKIP 9 | PASS 1159

All 4 previously-failing tests now correctly skip on non-UTF-8 locales.

[LeonidasZhak]

I am withdrawing this PR as part of a broader cleanup of an oversized automated contribution batch. I am sorry for the review noise and the pressure this may have put on maintainers. Going forward I will keep contributions to this project much more limited and higher-signal, ideally only one or two focused PRs at a time. Thank you for maintaining the project.