feat: bundle claude code CLI for linux arm64 (#373)

Currently wheels with packaged claude-code CLI are only published for
windows amd64, linux x86_64 and macos arm64. For version 0.1.10, we can
see the following download files are available on pypi contain the
following artifacts:
https://pypi.org/project/claude-agent-sdk/0.1.10/#files

- claude_agent_sdk-0.1.10.tar.gz
- claude_agent_sdk-0.1.10-py3-none-win_amd64.whl
- claude_agent_sdk-0.1.10-py3-none-manylinux_2_17_x86_64.whl
- claude_agent_sdk-0.1.10-py3-none-macosx_11_0_arm64.whl

The existing publishing code should support adding a new linux arm64
wheel builder, using the Github ARM runners:
https://github.blog/changelog/2025-08-07-arm64-hosted-runners-for-public-repositories-are-now-generally-available/

Unfortunately, there's no `ubuntu-latest-arm` label similar to the one
we use for the other builds, so I'm using the `ubuntu-24.04-arm` label.

.github/workflows/publish.yml

@@ -61,7 +61,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]
     permissions:
       contents: write
       pull-requests: write