fix: wrap PosixPath in str() for open() in Python 3.4

Python 3.4 doesn't support passing pathlib.Path objects to the builtin
open(); that was added in Python 3.6. Use str(path) explicitly.

Author: KowalskiThomas

tests/integration/dogshell/test_dogshell.py

@@ -750,7 +750,7 @@ def test_security_monitoring_rules(self, dogshell, get_unique, tmp_path):
             "type": "log_detection"
         }
 
-        with open(rule_file, "w") as f:
+        with open(str(rule_file), "w") as f:
             json.dump(rule_data, f)
 
         # Create rule
@@ -772,7 +772,7 @@ def test_security_monitoring_rules(self, dogshell, get_unique, tmp_path):
         updated_name = "Updated Rule {}".format(unique)
         rule_data["name"] = updated_name
 
-        with open(rule_file, "w") as f:
+        with open(str(rule_file), "w") as f:
             json.dump(rule_data, f)
 
         out, _, _ = dogshell(["security-monitoring", "rules", "update", rule_id, "--file", str(rule_file)])