Bump syn from 1.0.103 to 1.0.104 (#2466)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.103 to 1.0.104.
<details>
<summary>Commits</summary>
<ul>
<li><a href="78fa618e96"><code>78fa618</code></a> Release 1.0.104</li>
<li><a href="e054b03a3b"><code>e054b03</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/syn/issues/1244">#1244</a> from dtolnay/isnone</li>
<li><a href="3a0406db04"><code>3a0406d</code></a> Make PathArguments::is_none() public</li>
<li><a href="ac1dbf5d85"><code>ac1dbf5</code></a> Time out workflows after 45 minutes</li>
<li><a href="f510eb0ba9"><code>f510eb0</code></a> Update test suite to nightly-2022-11-25</li>
<li><a href="20087fc51c"><code>20087fc</code></a> Update test suite to nightly-2022-11-24</li>
<li><a href="dbc86fe1ed"><code>dbc86fe</code></a> Suppress &quot;emit&quot;:&quot;dep-info&quot; json from syn-test-suite-feature-check</li>
<li><a href="1e8227295e"><code>1e82272</code></a> Fix renamed let_underscore_drop lint</li>
<li><a href="754236dbe6"><code>754236d</code></a> Update test suite to nightly-2022-11-23</li>
<li><a href="4245c41f22"><code>4245c41</code></a> Update test suite to nightly-2022-11-19</li>
<li>Additional commits viewable in <a href="https://github.com/dtolnay/syn/compare/1.0.103...1.0.104">compare view</a></li>
</ul>
</details>
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</details>

Cargo.lock

@@ -1737,9 +1737,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.103"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
+checksum = "4ae548ec36cf198c0ef7710d3c230987c2d6d7bd98ad6edc0274462724c585ce"
 dependencies = [
  "proc-macro2",
  "quote",

boa_macros/Cargo.toml

@@ -14,6 +14,6 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.21"
-syn = "1.0.103"
+syn = "1.0.104"
 proc-macro2 = "1.0"
 synstructure = "0.12"