chore: update to stable snakemake (#19)

Author: johanneskoester

pyproject.toml

@@ -15,7 +15,7 @@ snakemake-interface-executor-plugins = "^9.0.0"
 snakemake-interface-common = "^1.13.0"
 
 [tool.poetry.group.dev.dependencies]
-snakemake = {git = "https://github.com/snakemake/snakemake.git", branch = "main"}
+snakemake = "^8.20.1"
 black = "^23.7.0"
 flake8 = ">=6.1,<8.0"
 coverage = "^7.3.0"