Release sglang kernel 0.4.0 (#20440)

Co-authored-by: Baizhou Zhang <sobereddiezhang@gmail.com>

scripts/release/README.md

@@ -25,17 +25,18 @@ python scripts/release/bump_sglang_version.py 0.5.3rc0
 - `python/sglang/version.py`
 
 ### `bump_kernel_version.py`
-Updates sgl-kernel version across all relevant files following the pattern from [PR #10732](https://github.com/sgl-project/sglang/pull/10732).
+Updates the `sglang-kernel` release version across all relevant files following the pattern from [PR #10732](https://github.com/sgl-project/sglang/pull/10732).
 
 **Usage:**
 ```bash
-python scripts/release/bump_kernel_version.py 0.3.12
+python scripts/release/bump_kernel_version.py 0.4.0
 ```
 
 **Files updated:**
 - `sgl-kernel/pyproject.toml`
 - `sgl-kernel/pyproject_cpu.toml`
 - `sgl-kernel/pyproject_rocm.toml`
+- `sgl-kernel/pyproject_musa.toml`
 - `sgl-kernel/python/sgl_kernel/version.py`
 
 ## Manual Testing Instructions
@@ -68,7 +69,7 @@ python scripts/release/bump_kernel_version.py 0.3.12
 
 1. **Run the script:**
    ```bash
-   python scripts/release/bump_kernel_version.py 0.3.13
+   python scripts/release/bump_kernel_version.py 0.4.0
    ```
 
 2. **Verify changes with git diff:**
@@ -78,8 +79,8 @@ python scripts/release/bump_kernel_version.py 0.3.12
 
 3. **Check specific files contain the new version:**
    ```bash
-   grep -r "0.3.13" sgl-kernel/python/sgl_kernel/version.py
-   grep -r "0.3.13" sgl-kernel/pyproject.toml
+   grep -r "0.4.0" sgl-kernel/python/sgl_kernel/version.py
+   grep -r "0.4.0" sgl-kernel/pyproject.toml
    ```
 
 4. **Reset changes (if testing):**
@@ -90,6 +91,6 @@ python scripts/release/bump_kernel_version.py 0.3.12
 ## Version Format Validation
 
 - **SGLang versions:** `X.Y.Z` or `X.Y.ZrcN` (e.g., `0.5.3` or `0.5.3rc0`)
-- **Kernel versions:** `X.Y.Z` (e.g., `0.3.12`)
+- **Kernel versions:** `X.Y.Z` (e.g., `0.4.0`)
 
 The scripts will validate the version format and exit with an error if invalid.