Update heroku/buildpacks-dotnet to v0.3.0 (#661)

## heroku/dotnet

### Changed

- The `sdk` element in detected `global.json` files is no longer required. The SDK version to install is now inferred from the solution/project files when `global.json` doesn't define SDK configuration. ([#202](heroku/buildpacks-dotnet#202))
- The buildpack will now set `--artifacts-path` to a temporary directory during `dotnet publish`. This change reduces the number of unused, duplicated and/or intermediate files in the app directory. Published output for each project is still written to the same location relative to the the project directory (`bin/publish`, as configured using the `PublishDir` property). ([#186](heroku/buildpacks-dotnet#186))

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>

Author: heroku-linguist[bot]

builder-22/builder.toml

@@ -23,7 +23,7 @@ version = "0.20.6"
 
 [[buildpacks]]
   id = "heroku/dotnet"
-  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:fd0a131bcfb0af5ba9b342855c71a0a3b5ccea944d9e7c421d5b50fe9b6b3efa"
+  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:066863a37e4620fa409611f6bdca1966aabe5c7a132d15c37059b99ca01f352e"
 
 [[buildpacks]]
   id = "heroku/go"
@@ -154,7 +154,7 @@ version = "0.20.6"
     optional = true
   [[order.group]]
     id = "heroku/dotnet"
-    version = "0.2.2"
+    version = "0.3.0"
   [[order.group]]
     id = "heroku/procfile"
     version = "4.1.0"

builder-24/builder.toml

@@ -23,7 +23,7 @@ mirrors = ["public.ecr.aws/heroku/heroku:24"]
 
 [[buildpacks]]
   id = "heroku/dotnet"
-  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:fd0a131bcfb0af5ba9b342855c71a0a3b5ccea944d9e7c421d5b50fe9b6b3efa"
+  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:066863a37e4620fa409611f6bdca1966aabe5c7a132d15c37059b99ca01f352e"
 
 [[buildpacks]]
   id = "heroku/go"
@@ -154,7 +154,7 @@ mirrors = ["public.ecr.aws/heroku/heroku:24"]
     optional = true
   [[order.group]]
     id = "heroku/dotnet"
-    version = "0.2.2"
+    version = "0.3.0"
   [[order.group]]
     id = "heroku/procfile"
     version = "4.1.0"