build(deps): update gmsh requirement from 4.13.0 to 4.13.1

Updates the requirements on [gmsh](https://gmsh.info) to permit the latest version.

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

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

pyproject.toml

@@ -29,7 +29,7 @@ Documentation = "https://HelgeGehring.github.io/femwell/"
 [tool.poetry.dependencies]
 python = ">=3.8"
 scikit-fem = ">=8.1.0"
-gmsh = "4.13.0"
+gmsh = "4.13.1"
 pygmsh = "*"
 matplotlib = "*"
 meshwell = ">=1.0.2"