Update dependency Valleysoft.DockerfileModel to 1.2.0 (#1291)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -51,7 +51,7 @@
     <PackageVersion Include="Tomlyn.Signed" Version="0.17.0" />
     <PackageVersion Include="yamldotnet" Version="15.1.6" />
     <PackageVersion Include="Faker.net" Version="2.0.163" />
-    <PackageVersion Include="Valleysoft.DockerfileModel" Version="1.1.1" />
+    <PackageVersion Include="Valleysoft.DockerfileModel" Version="1.2.0" />
     <!-- Fix security alerts -->
     <PackageVersion Include="System.Formats.Asn1" Version="6.0.1" />
   </ItemGroup>