Auto merge of #28845 - servo:dependabot/cargo/string_cache-0.8.4, r=jdm

Bump string_cache from 0.8.3 to 0.8.4

Bumps [string_cache](https://github.com/servo/string-cache) from 0.8.3 to 0.8.4.
<details>
<summary>Commits</summary>
<ul>
<li><a href="899242758b"><code>8992427</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/string-cache/issues/258">#258</a> - dsherret:0_8_4, r=jdm</li>
<li><a href="aa644096ae"><code>aa64409</code></a> 0.8.4</li>
<li><a href="3e36cbfbfd"><code>3e36cbf</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/string-cache/issues/256">#256</a> - upsuper-forks:once_cell, r=jdm</li>
<li><a href="9ae0f889bb"><code>9ae0f88</code></a> Replace lazy_static with once_cell</li>
<li><a href="9b7abe4e34"><code>9b7abe4</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/string-cache/issues/254">#254</a> - dsherret:chore_bump_parking_lot, r=KiChjang</li>
<li><a href="6c0f825381"><code>6c0f825</code></a> Bump CI to rust 1.49 (not sure if desired though)</li>
<li><a href="cbd1dc3b7f"><code>cbd1dc3</code></a> fix: bump parking lot to 0.12 in order to not create wasm export</li>
<li>See full diff in <a href="https://github.com/servo/string-cache/compare/v0.8.3...v0.8.4">compare view</a></li>
</ul>
</details>
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Cargo.lock

@@ -6256,13 +6256,13 @@ dependencies = [
 
 [[package]]
 name = "string_cache"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33994d0838dc2d152d17a62adf608a869b5e846b65b389af7f3dbc1de45c5b26"
+checksum = "213494b7a2b503146286049378ce02b482200519accc31872ee8be91fa820a08"
 dependencies = [
- "lazy_static",
  "new_debug_unreachable",
- "parking_lot 0.11.0",
+ "once_cell",
+ "parking_lot 0.12.0",
  "phf_shared 0.10.0",
  "precomputed-hash",
  "serde",