build(deps): bump sympy from 1.12 to 1.13.1 in /DeepFilterNet

Bumps [sympy](https://github.com/sympy/sympy) from 1.12 to 1.13.1.
- [Release notes](https://github.com/sympy/sympy/releases)
- [Commits](sympy/sympy@sympy-1.12...sympy-1.13.1)

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

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