Bump Polyfill from 1.33.2 to 1.34.0 in /src

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 1.33.2 to 1.34.0.
- [Commits](https://github.com/SimonCropp/Polyfill/commits/1.34.0)

---
updated-dependencies:
- dependency-name: Polyfill
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Verify.SourceGenerators/Verify.SourceGenerators.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Argon" Version="0.14.0" />
-    <PackageReference Include="Polyfill" Version="1.33.2" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="1.34.0" PrivateAssets="all" />
     <PackageReference Include="Verify" Version="22.8.0" />
     <PackageReference Include="ProjectDefaults" Version="1.0.107" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" PrivateAssets="all" />