Bump Microsoft.SemanticKernel.Abstractions from 1.5.0 to 1.6.3

Bumps [Microsoft.SemanticKernel.Abstractions](https://github.com/microsoft/semantic-kernel) from 1.5.0 to 1.6.3.
- [Release notes](https://github.com/microsoft/semantic-kernel/releases)
- [Commits](microsoft/semantic-kernel@dotnet-1.5.0...dotnet-1.6.3)

---
updated-dependencies:
- dependency-name: Microsoft.SemanticKernel.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Directory.Packages.props

@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageVersion Include="Microsoft.KernelMemory.Abstractions" Version="0.28.240212.1" />
     <PackageVersion Include="Microsoft.SemanticKernel" Version="1.3.0" />
-    <PackageVersion Include="Microsoft.SemanticKernel.Abstractions" Version="1.5.0" />
+    <PackageVersion Include="Microsoft.SemanticKernel.Abstractions" Version="1.6.3" />
     <PackageVersion Include="System.Text.Json" Version="8.0.3" />
     <!-- Microsoft.Extensions.Configuration -->
     <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />