testing_macros: Add missing full feature to syn dependency

[MichaReiser]

Summary

Fix the standalone build of ruff_testing_macros.

Before:

error[E0432]: unresolved imports `syn::FnArg`, `syn::ItemFn`, `syn::Pat`
  --> crates/ruff_testing_macros/src/lib.rs:13:61
   |
13 | use syn::{bracketed, parse_macro_input, parse_quote, Error, FnArg, ItemFn, LitStr, Pat, Token};
   |                                                             ^^^^^  ^^^^^^          ^^^
   |                                                             |      |               |
   |                                                             |      |               no `Pat` in the root
   |                                                             |      |               help: a similar name exists in the module: `Path`
   |                                                             |      no `ItemFn` in the root
   |                                                             no `FnArg` in the root

For more information about this error, try `rustc --explain E0432`.
error: could not compile `ruff_testing_macros` due to previous error

Test Plan

❯ cargo build -p ruff_testing_macros
   Compiling proc-macro2 v1.0.56
   Compiling unicode-ident v1.0.8
   Compiling quote v1.0.27
   Compiling glob v0.3.1
   Compiling syn v2.0.15
   Compiling ruff_testing_macros v0.0.0 (/home/micha/astral/ruff/crates/ruff_testing_macros)
    Finished dev [unoptimized + debuginfo] target(s) in 2.54s

[MichaReiser]

Current dependencies on/for this PR:

• main
  • PR testing_macros: Add missing full feature to syn dependency #4722 👈

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[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
linter/all-rules/large/dataset.py          1.00     17.5±0.40ms     2.3 MB/sec    1.00     17.6±0.34ms     2.3 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.00      4.2±0.13ms     4.0 MB/sec    1.01      4.2±0.23ms     3.9 MB/sec
linter/all-rules/numpy/globals.py          1.00    530.8±9.57µs     5.6 MB/sec    1.01   534.8±20.80µs     5.5 MB/sec
linter/all-rules/pydantic/types.py         1.00      7.2±0.18ms     3.6 MB/sec    1.03      7.4±0.23ms     3.5 MB/sec
linter/default-rules/large/dataset.py      1.01      8.2±0.14ms     4.9 MB/sec    1.00      8.1±0.15ms     5.0 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1777.4±40.65µs     9.4 MB/sec    1.01  1800.6±33.99µs     9.2 MB/sec
linter/default-rules/numpy/globals.py      1.00    216.5±9.26µs    13.6 MB/sec    1.02    220.1±6.83µs    13.4 MB/sec
linter/default-rules/pydantic/types.py     1.00      3.7±0.07ms     6.8 MB/sec    1.02      3.8±0.08ms     6.7 MB/sec
parser/large/dataset.py                    1.00      6.4±0.08ms     6.3 MB/sec    1.00      6.4±0.12ms     6.3 MB/sec
parser/numpy/ctypeslib.py                  1.00  1281.7±25.83µs    13.0 MB/sec    1.00  1279.5±41.25µs    13.0 MB/sec
parser/numpy/globals.py                    1.00    127.7±2.67µs    23.1 MB/sec    1.01    129.3±5.70µs    22.8 MB/sec
parser/pydantic/types.py                   1.01      2.8±0.06ms     9.1 MB/sec    1.00      2.8±0.07ms     9.1 MB/sec

Windows

group                                      main                                   pr
-----                                      ----                                   --
linter/all-rules/large/dataset.py          1.08     21.7±0.77ms  1922.1 KB/sec    1.00     20.1±1.12ms     2.0 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.03      5.3±0.21ms     3.1 MB/sec    1.00      5.2±0.21ms     3.2 MB/sec
linter/all-rules/numpy/globals.py          1.05   632.9±23.43µs     4.7 MB/sec    1.00   605.0±39.02µs     4.9 MB/sec
linter/all-rules/pydantic/types.py         1.08      8.9±0.38ms     2.8 MB/sec    1.00      8.3±0.36ms     3.1 MB/sec
linter/default-rules/large/dataset.py      1.10     10.4±0.37ms     3.9 MB/sec    1.00      9.5±0.39ms     4.3 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.14      2.3±0.20ms     7.1 MB/sec    1.00      2.1±0.09ms     8.1 MB/sec
linter/default-rules/numpy/globals.py      1.00   257.7±14.08µs    11.5 MB/sec    1.00   258.3±17.02µs    11.4 MB/sec
linter/default-rules/pydantic/types.py     1.04      4.6±0.21ms     5.6 MB/sec    1.00      4.4±0.20ms     5.8 MB/sec
parser/large/dataset.py                    1.00      8.1±0.27ms     5.0 MB/sec    1.03      8.3±0.21ms     4.9 MB/sec
parser/numpy/ctypeslib.py                  1.00  1553.8±46.19µs    10.7 MB/sec    1.00  1547.5±60.79µs    10.8 MB/sec
parser/numpy/globals.py                    1.00    154.7±7.35µs    19.1 MB/sec    1.04    161.6±7.98µs    18.3 MB/sec
parser/pydantic/types.py                   1.00      3.4±0.09ms     7.4 MB/sec    1.03      3.5±0.11ms     7.2 MB/sec