Cspdk

- update gdsfactory 8.15.0 [72](https://github.com/gdsfactory/cspdk/pull/72)

- add type annotations for si220 [68](https://github.com/gdsfactory/cspdk/pull/68)
- fix sample routing functions [63](https://github.com/gdsfactory/cspdk/pull/63)
- Update gdsfactory 8.13.3 [70](https://github.com/gdsfactory/cspdk/pull/70)

- add docstrings [54](https://github.com/gdsfactory/cspdk/pull/54)
- cspdk cleanup [51](https://github.com/gdsfactory/cspdk/pull/51)

- update gdsfactory to 8.4.0 [50](https://github.com/gdsfactory/cspdk/pull/50)

- fix tests [47](https://github.com/gdsfactory/cspdk/pull/47)
- update gdsfactory to 8.3.0 [48](https://github.com/gdsfactory/cspdk/pull/48)

- Gdsfactory8 [43](https://github.com/gdsfactory/cspdk/pull/43)
- add gplugins to pyproject [46](https://github.com/gdsfactory/cspdk/pull/46)
- Fixes remove partials [45](https://github.com/gdsfactory/cspdk/pull/45)
- fixing tech installation on windows [35](https://github.com/gdsfactory/cspdk/pull/35)
- better values for cross_section [39](https://github.com/gdsfactory/cspdk/pull/39)
- use approx version [37](https://github.com/gdsfactory/cspdk/pull/37)
- update gdsfactory [34](https://github.com/gdsfactory/cspdk/pull/34)