Bump paddlepaddle from 2.4.2 to 2.6.0 in /python/paddleserver

Bumps [paddlepaddle](https://github.com/paddlepaddle/paddle) from 2.4.2 to 2.6.0.
- [Release notes](https://github.com/paddlepaddle/paddle/releases)
- [Changelog](https://github.com/PaddlePaddle/Paddle/blob/develop/RELEASE.md)
- [Commits](PaddlePaddle/Paddle@v2.4.2...v2.6.0)

---
updated-dependencies:
- dependency-name: paddlepaddle
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>