deps: Bump JD.MSBuild.Fluent from 1.3.9 to 1.3.15

---
updated-dependencies:
- dependency-name: JD.MSBuild.Fluent
  dependency-version: 1.3.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/JD.Efcpt.Build/JD.Efcpt.Build.csproj

@@ -38,7 +38,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="JD.MSBuild.Fluent" Version="1.3.9" />
+    <PackageReference Include="JD.MSBuild.Fluent" Version="1.3.15" />
 
     <!-- Reference Tasks project to use nameof() for type safety -->
     <ProjectReference Include="../JD.Efcpt.Build.Tasks/JD.Efcpt.Build.Tasks.csproj"