[#1208] Bitrise fails to build

- hotfix for explicit use of self in a Task, CI fails to build it without it

Sources/ZcashLightClientKit/Block/CompactBlockProcessor.swift

@@ -725,7 +725,7 @@ extension CompactBlockProcessor {
                                 """
                             )
                             await self.start()
-                        } else if await hasRetryAttempt() {
+                        } else if await self.hasRetryAttempt() {
                             await self.failure(ZcashError.compactBlockProcessorMaxAttemptsReached(self.config.retries))
                         }
                     } else {