Bump Dhgms.QualityAssurancePack from 2.3.11 to 2.3.15 in /src (#1033)

Bumps [Dhgms.QualityAssurancePack](https://github.com/DHGMS-Solutions/qualityassurancepack) from 2.3.11 to 2.3.15.
- [Release notes](https://github.com/DHGMS-Solutions/qualityassurancepack/releases)
- [Commits](DHGMS-Solutions/qualityassurancepack@2.3.11...2.3.15)

---
updated-dependencies:
- dependency-name: Dhgms.QualityAssurancePack
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.build.props

@@ -57,7 +57,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="$(IsWasmProject) == ''">
-    <PackageReference Include="Dhgms.QualityAssurancePack" Version="2.3.11" PrivateAssets="All" />
+    <PackageReference Include="Dhgms.QualityAssurancePack" Version="2.3.15" PrivateAssets="All" />
   </ItemGroup>
   <ItemGroup>
     <AdditionalFiles Include="$(MSBuildThisFileDirectory)stylecop.json" Link="stylecop.json" />