fix: fix envvar declarations code

Author: johanneskoester

snakemake_interface_executor_plugins/executors/real.py

@@ -122,7 +122,7 @@ def common_settings(self):
 
     def get_envvar_declarations(self):
         if self.common_settings.pass_envvar_declarations_to_cmd:
-            defs = " ".join(f"{var}={repr(value)}" for var, value in self.envvars())
+            defs = " ".join(f"{var}={repr(value)}" for var, value in self.envvars().items())
             return f"export {defs} &&"
         else:
             return ""