Bump Basic.Reference.Assemblies.Net60 and System.Buffers (#182)

Bumps [Basic.Reference.Assemblies.Net60](https://github.com/jaredpar/basic-reference-assemblies) and System.Buffers. These dependencies needed to be updated together.

Updates `Basic.Reference.Assemblies.Net60` from 1.6.0 to 1.7.9
- [Release notes](https://github.com/jaredpar/basic-reference-assemblies/releases)
- [Commits](jaredpar/basic-reference-assemblies@v1.6.0...v1.7.9)

Updates `System.Buffers` from 4.5.1 to 4.5.1

---
updated-dependencies:
- dependency-name: Basic.Reference.Assemblies.Net60
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: System.Buffers
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Directory.Packages.props

@@ -5,7 +5,7 @@
     <_RoslynVersion>4.11.0</_RoslynVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="Basic.Reference.Assemblies.Net60" Version="1.6.0" />
+    <PackageVersion Include="Basic.Reference.Assemblies.Net60" Version="1.7.9" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.13.5" />
     <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.13.5" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.2" />