Update access of cut branch workflow and delete deprecated release workflow (#21231)

.github/workflows/release-branch-cut.yml

@@ -16,6 +16,7 @@ on:
 permissions:
   actions: write
   contents: write
+  issues: read
   pull-requests: read
 
 jobs:

scripts/release/bump_sglang_version.py

@@ -1,40 +0,0 @@
-#!/usr/bin/env python3
-
-import argparse
-from pathlib import Path
-
-from utils import bump_version
-
-
-def main():
-    parser = argparse.ArgumentParser(
-        description="Bump SGLang version across all relevant files"
-    )
-    parser.add_argument(
-        "new_version",
-        help="New version (e.g., 0.5.4, 0.5.3rc0, or 0.5.3.post1)",
-    )
-    args = parser.parse_args()
-
-    version_file = Path("python/sglang/version.py")
-
-    files_to_update = [
-        Path("benchmark/deepseek_v3/README.md"),
-        Path("docker/Dockerfile"),
-        Path("docker/rocm.Dockerfile"),
-        Path("docs/get_started/install.md"),
-        Path("docs/platforms/amd_gpu.md"),
-        Path("docs/platforms/ascend_npu.md"),
-        Path("python/pyproject.toml"),
-        Path("python/pyproject_other.toml"),
-        Path("python/pyproject_npu.toml"),
-        Path("python/pyproject_cpu.toml"),
-        Path("python/pyproject_xpu.toml"),
-        Path("python/sglang/version.py"),
-    ]
-
-    bump_version(args.new_version, version_file, files_to_update)
-
-
-if __name__ == "__main__":
-    main()