chore(deps): update oxc to ^0.157.0 - #894

oxc 0.156 renames `VariableDeclarationKind::is_await` to
`is_await_using`. Both return `self == Self::AwaitUsing`, so top-level
await detection does not change.

This PR keeps the Renovate commit from #894 and adds the rename that
#894 needs to compile. Supersedes #894.

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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_Requested by **Brooklyn** · [project
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<!-- routine:prune-tests:subset-file-url-tests -->

Before: four one-line file URL tests from #760
(`windows_drive_url_parses`, `windows_drive_path_generates`,
`windows_unc_url_parses_to_unc_path`,
`non_windows_behavior_is_unchanged`) each checked a strict subset of
what another test in the same module checks. No regression fails one of
them without also failing a stronger test.

After: those four tests are gone. Only `#[cfg(test)]` modules in
`src/lib.rs` and `src/windows_file_url.rs` change.

How: each removal was defended by mutating the product code with the
most realistic regression it could catch, running `cargo test
--all-features --lib`, and reverting.

Note: the CI job "Test WASI target" (step "Test bindings") already fails
on `main`, since `ffa98c1` (#901, 2026-11-01). It will fail here too;
this PR does not touch it.

### Totals

- Files touched: 2, test modules only.
- Cases deleted: **4 of 698** (Rust lib 57, Vitest 599, integrate-module
20, integrate-module-bundler 22). After: 694.
- Cases folded: 0.
- Net lines: **−25** (+0 / −25).
- Runtime saved: under 1 ms (each removed case reports `<0.000s`).

### Removals

1. **`windows_drive_url_parses`** (`file:///C:/a/b.ts` → `C:/a/b.ts`).
Keeping the leading `/` in the drive form also fails
`windows_scheme_is_case_insensitive`,
`windows_query_and_fragment_are_not_part_of_the_path`,
`windows_dot_segments_are_normalized` and
`windows_drive_path_is_percent_encoded`.
2. **`windows_drive_path_generates`** (`C:\a\b.ts` →
`file:///C:/a/b.ts`). Not converting backslashes also fails
`windows_drive_path_is_percent_encoded` and
`windows_verbatim_prefix_is_ignored`; converting only the first one also
fails `windows_drive_path_is_percent_encoded`, whose `c:\a:b\x.ts` row
covers the same path.
3. **`windows_unc_url_parses_to_unc_path`** (a three-segment UNC URL).
Converting only the first separator, the one thing its depth adds, also
fails `windows_unc_url_decodes_escapes`, `windows_mapping_interactions`
and `windows_dot_segments_are_normalized`.
4. **`non_windows_behavior_is_unchanged`** (POSIX `file_url_to_path` for
a plain and a `%20` path). It was added with the fix for #744, Windows
URL rules leaking into POSIX paths. That bug's regression (POSIX
`file_url_to_path` calling `windows_file_url::url_to_path`) also fails
`posix_file_url_round_trips`,
`watch_report_urls_are_encoded_and_absolute_only` and
`diagnostics_render_location_and_code_frame`. Dropping `'0'` from
`hex_digit`, skipping decoding, and breaking the no-`%` fast path each
also fail other tests (5, 3 and `posix_file_url_round_trips`).

### Kept after defense

- `windows_escaped_unc_path_round_trips`: its decode-back half is the
only UNC-form check of `%25`.

### Case counts

| suite | before | after | delta |
|---|---|---|---|
| `src/windows_file_url.rs` tests | 32 | 29 | −3 |
| `src/lib.rs` tests | 25 | 24 | −1 |
| integrate-vitest, integrate-module, integrate-module-bundler | 641 |
641 | 0 |

0 failures before and after.

### What ran and what did not

- At `ffa98c1`: all three JS suites against a debug addon, and `cargo
test --all-features` with `--report-time`.
- On this branch: `cargo test --all-features --lib` (53 passed), `cargo
fmt --check`, `cargo clippy --all-targets --all-features -- -D warnings`
and `git diff --check`, all clean.
- Not run: the 3 `loader_context` tests under `--no-default-features`,
Windows, the WASI build and the bench. The JS suites were not re-run
after the change, which touches only `#[cfg(test)]` code.

Open pull requests: neither open PR (#903, #894) touches a test file.

Ages: all four tests were added on 2026-09-14 in #760 and are unchanged
since. None is in a permission or security suite.

To revert: `git revert 53ef6d7`.

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