Bump sgl kernel to 0.0.2.post19

[ByronHsu]

Motivation

for #3134

Modifications

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling.

[zhyncs]

pyproject also needs updating.

[zhyncs]

sglang/sgl-kernel/pyproject.toml

Line 7 in 1e3e521

version = "0.0.2.post18"

[ByronHsu]

@zhyncs done