perf(plugin): bump batch_apply_deadlock_retry_max_count default 1 -> 3

A single retry is enough to absorb a one-shot deadlock, but real deadlock
storms tend to come in short clusters as concurrent batches retry into the
same lock order. Default 3 gives the plugin a small budget to walk through
those clusters without bubbling the error out to the reconciler client.

0 still disables retries; operators can lower or raise it via the plugin
setting.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ldrozdz93

netbox_diode_plugin/__init__.py

@@ -50,9 +50,9 @@ class NetBoxDiodePluginConfig(PluginConfig):
 
         # Max number of retries when the batch apply endpoint hits a
         # Postgres deadlock (40P01) or serialization failure (40001).
-        # 0 disables retries; default 1 means up to one retry after the
-        # initial attempt (2 attempts total).
-        "batch_apply_deadlock_retry_max_count": 1,
+        # 0 disables retries; default 3 means up to three retries after
+        # the initial attempt (4 attempts total).
+        "batch_apply_deadlock_retry_max_count": 3,
     }