Update sympy requirement from ~=1.12 to ~=1.13

Updates the requirements on [sympy](https://github.com/sympy/sympy) to permit the latest version.
- [Release notes](https://github.com/sympy/sympy/releases)
- [Commits](sympy/sympy@sympy-1.12...sympy-1.13.0)

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

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

requirements.txt

@@ -2,7 +2,7 @@ matplotlib~=3.8.4
 numpy~=1.26.4
 scipy~=1.13.1
 pandas~=2.2.2
-sympy~=1.12
+sympy~=1.13
 voila~=0.5.7
 voila-osscar-template~=0.3.2
 Cython~=3.0.10