fix: update version to 3.8.post0.dev13 in pyproject.toml

Author: steffengraber

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "nest-simulator"
-version = "3.8.post0.dev12"
+version = "3.8.post0.dev13"
 description = "NEST is a simulator for spiking neural network models that focuses on the dynamics, size and structure of neural systems rather than on the exact morphology of individual neurons."
 keywords = ["nest", "simulator", "neuroscience", "neural", "neuron", "network", "ai", "spike", "spiking"]
 readme = "README.md"