Update pyproject.toml (openvinotoolkit#844)

See warnings from build tool
https://github.com/openvinotoolkit/openvino.genai/actions/runs/10768130167
```
[OpenVINO genai extension (cmake + wheel)](https://github.com/openvinotoolkit/openvino.genai/actions/runs/10768130167/job/29856868111#step:11:76)
py_build_cmake.config.load:Name normalized from openvino_genai to openvino-genai
```

pyproject.toml

@@ -1,5 +1,5 @@
 [project]
-name = "openvino_genai"
+name = "openvino-genai"
 version = "2024.5.0.0"
 description = "Python bindings for https://github.com/openvinotoolkit/openvino.genai"
 requires-python = ">=3.8"