Bump SecurityCodeScan.VS2019 from 5.2.1 to 5.6.0 in /src

Bumps [SecurityCodeScan.VS2019](https://github.com/security-code-scan/security-code-scan) from 5.2.1 to 5.6.0.
- [Release notes](https://github.com/security-code-scan/security-code-scan/releases)
- [Commits](security-code-scan/security-code-scan@5.2.1...5.6.0)

---
updated-dependencies:
- dependency-name: SecurityCodeScan.VS2019
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Dhgms.QualityAssurancePack/Dhgms.QualityAssurancePack.csproj

@@ -26,7 +26,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" />
     <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="6.0.0" />
     <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.0.64" />
-    <PackageReference Include="SecurityCodeScan.VS2019" Version="5.2.1" />
+    <PackageReference Include="SecurityCodeScan.VS2019" Version="5.6.0" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.354" />
   </ItemGroup>
 </Project>