Update WhereTheWaterFlows requirement from 0.10, 0.11 to 0.10, 0.11, 0.13

Updates the requirements on [WhereTheWaterFlows](https://github.com/mauro3/WhereTheWaterFlows.jl) to permit the latest version.

Updates `WhereTheWaterFlows` to 0.13.0
- [Release notes](https://github.com/mauro3/WhereTheWaterFlows.jl/releases)
- [Commits](https://github.com/mauro3/WhereTheWaterFlows.jl/commits/v0.13.0)

---
updated-dependencies:
- dependency-name: WhereTheWaterFlows
  dependency-version: 0.13.0
  dependency-type: direct:production
  dependency-group: all-julia-dependencies
...

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

Author: dependabot[bot]

Project.toml

@@ -70,7 +70,7 @@ Parameters = "0.9 - 0.12"
 SpecialFunctions = "1.0, 2"
 StaticArrays = "1"
 Statistics = "1"
-WhereTheWaterFlows = "0.10, 0.11"
+WhereTheWaterFlows = "0.10, 0.11, 0.13"
 WriteVTK = "1"
 julia = "1.9"