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Fix race condition that leads to panic #306

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Fix race condition that leads to panic #306

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Frequent resubscriptions may prevent synchronized closed channel checks, potentially leading to panic:

panic: send on closed channel

goroutine 1688260 [running]:
github.com/gagliardetto/solana-go/rpc/ws.(*Client).handleSubscriptionMessage(0xc001250720, 0x2, {0xc0002e6800, 0x95, 0x200})
	/vendor/github.com/gagliardetto/solana-go/rpc/ws/client.go:258 +0x34b
github.com/gagliardetto/solana-go/rpc/ws.(*Client).handleMessage(0xc001250720, {0xc0002e6800, 0x95, 0x200})
	/vendor/github.com/gagliardetto/solana-go/rpc/ws/client.go:191 +0x10b
github.com/gagliardetto/solana-go/rpc/ws.(*Client).receiveMessages(0xc001250720)
	/vendor/github.com/gagliardetto/solana-go/rpc/ws/client.go:153 +0x1f
created by github.com/gagliardetto/solana-go/rpc/ws.ConnectWithOptions in goroutine 6
	/vendor/github.com/gagliardetto/solana-go/rpc/ws/client.go:121 +0x356

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