Bump paddlepaddle from 2.5.2 to 2.6.1 in /src/bindings/python

Bumps [paddlepaddle](https://github.com/paddlepaddle/paddle) from 2.5.2 to 2.6.1.
- [Release notes](https://github.com/paddlepaddle/paddle/releases)
- [Changelog](https://github.com/PaddlePaddle/Paddle/blob/develop/RELEASE.md)
- [Commits](https://github.com/paddlepaddle/paddle/compare/v2.5.2...v2.6.1)

---
updated-dependencies:
- dependency-name: paddlepaddle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/bindings/python/constraints.txt

@@ -17,7 +17,7 @@ patchelf<=0.17.2.1
 
 # Frontends
 docopt~=0.6.2
-paddlepaddle==2.5.2
+paddlepaddle==2.6.1
 tensorflow>=1.15.5,<2.17.0
 six~=1.16.0
 protobuf>=3.18.1,<4.0.0