Bump syn from 1.0.107 to 1.0.108 (#2616)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.107 to 1.0.108.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dtolnay/syn/releases">syn's releases</a>.</em></p>
<blockquote>
<h2>1.0.108</h2>
<ul>
<li>Fix handling of unusual whitespace after escaped newlines in <code>LitStr::value</code> (<a href="https://github-redirect.dependabot.com/dtolnay/syn/issues/1381">#1381</a>, thanks <a href="https://github.com/ModProg"><code>@​ModProg</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="01f69e937c"><code>01f69e9</code></a> Release 1.0.108</li>
<li><a href="62d0aeda48"><code>62d0aed</code></a> stricter parsing of string_continue escapes</li>
<li>See full diff in <a href="https://github.com/dtolnay/syn/compare/1.0.107...1.0.108">compare view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -3539,9 +3539,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.107"
+version = "1.0.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+checksum = "d56e159d99e6c2b93995d171050271edb50ecc5288fbc7cc17de8fdce4e58c14"
 dependencies = [
  "proc-macro2",
  "quote",

boa_macros/Cargo.toml

@@ -14,6 +14,6 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.23"
-syn = "1.0.107"
+syn = "1.0.108"
 proc-macro2 = "1.0"
 synstructure = "0.12"