Add minimum version for dulwich

Author: minitriga

poetry.lock

@@ -50,7 +50,7 @@ typer = { version = "^0.12.3", optional = true }
 pytest = { version = "*", optional = true }
 pyyaml = { version = "^6", optional = true }
 eval-type-backport = { version = "^0.2.2", python = "~3.9" }
-dulwich = "^0.22.7"
+dulwich = "^0.21.4"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "*"