feat: increase default healthcheck retries

Author: alukach

src/stac_auth_proxy/lifespan/ServerHealthCheck.py

@@ -15,7 +15,7 @@ class ServerHealthCheck:
     """Health check for upstream API."""
 
     url: str | HttpUrl
-    max_retries: int = 5
+    max_retries: int = 10
     retry_delay: float = 0.25
     retry_delay_max: float = 10.0
     timeout: float = 5.0