Bump mpmath from 1.2.1 to 1.3.0 in /test/oryx/sample-python (#554)

Bumps [mpmath](https://github.com/fredrik-johansson/mpmath) from 1.2.1 to 1.3.0.
- [Release notes](https://github.com/fredrik-johansson/mpmath/releases)
- [Changelog](https://github.com/mpmath/mpmath/blob/master/CHANGES)
- [Commits](https://github.com/fredrik-johansson/mpmath/compare/1.2.1...1.3.0)

---
updated-dependencies:
- dependency-name: mpmath
  dependency-type: direct:production
...
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test/oryx/sample-python/requirements.txt

-mpmath==1.2.1
+mpmath==1.3.0
 sympy==1.11.1