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-1.13.3)

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

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

requirements.txt

@@ -8,7 +8,7 @@ python-openstackclient==6.0.0
 PyYAML~=6.0
 shortuuid~=1.0.13
 sshtunnel~=0.4.0
-sympy~=1.12
+sympy~=1.13
 seedir~=0.5.0
 cryptography~=43.0.1
 uvicorn~=0.30.6