Bump YamlDotNet from 13.7.1 to 15.1.2 in /src

Bumps [YamlDotNet](https://github.com/aaubry/YamlDotNet) from 13.7.1 to 15.1.2.
- [Release notes](https://github.com/aaubry/YamlDotNet/releases)
- [Commits](aaubry/YamlDotNet@v13.7.1...v15.1.2)

---
updated-dependencies:
- dependency-name: YamlDotNet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/ActionsImporter.ThirdPartyLicenseGenerator/ActionsImporter.ThirdPartyLicenseGenerator.csproj

@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="YamlDotNet" Version="13.7.1" />
+      <PackageReference Include="YamlDotNet" Version="15.1.2" />
     </ItemGroup>
 
 </Project>