Update heroku/buildpacks-dotnet to v0.2.1 (#648)

## heroku/dotnet

### Changed

- The .NET SDK inventory was updated with new download URLs for version 9.0 release artifacts. [#197](heroku/buildpacks-dotnet#197)

### Added

- Support for .NET SDK versions: 8.0.113 (linux-amd64), 8.0.113 (linux-arm64), 8.0.309 (linux-amd64), 8.0.309 (linux-arm64), 8.0.406 (linux-amd64), 8.0.406 (linux-arm64), 9.0.103 (linux-amd64), 9.0.103 (linux-arm64), 9.0.200 (linux-amd64), 9.0.200 (linux-arm64). [#197](heroku/buildpacks-dotnet#197)

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

builder-22/builder.toml

@@ -23,7 +23,7 @@ version = "0.20.5"
 
 [[buildpacks]]
   id = "heroku/dotnet"
-  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:3b6f4ea628b030d8426676f40592cc1e91b150bbf7d5fff1689077dc3e704db0"
+  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:7a8806cfeb9090e52ee89534483ab2f76bd5b8c305feb5db99fb1755ce02d01c"
 
 [[buildpacks]]
   id = "heroku/go"
@@ -154,7 +154,7 @@ version = "0.20.5"
     optional = true
   [[order.group]]
     id = "heroku/dotnet"
-    version = "0.2.0"
+    version = "0.2.1"
   [[order.group]]
     id = "heroku/procfile"
     version = "4.0.0"

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@sha256:3b6f4ea628b030d8426676f40592cc1e91b150bbf7d5fff1689077dc3e704db0"
+  uri = "docker://docker.io/heroku/buildpack-dotnet@sha256:7a8806cfeb9090e52ee89534483ab2f76bd5b8c305feb5db99fb1755ce02d01c"
 
 [[buildpacks]]
   id = "heroku/go"
@@ -154,7 +154,7 @@ mirrors = ["public.ecr.aws/heroku/heroku:24"]
     optional = true
   [[order.group]]
     id = "heroku/dotnet"
-    version = "0.2.0"
+    version = "0.2.1"
   [[order.group]]
     id = "heroku/procfile"
     version = "4.0.0"