Bump mpmath in /pyperformance/data-files/benchmarks/bm_sympy

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](mpmath/mpmath@1.2.1...1.3.0)

---
updated-dependencies:
- dependency-name: mpmath
  dependency-version: 1.3.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyperformance/data-files/benchmarks/bm_sympy/requirements.txt

@@ -1,2 +1,2 @@
-mpmath==1.2.1
+mpmath==1.3.0
 sympy==1.8