fix: add missing error variable for non-unix build constraints

[huiyifyj]

Add missing errUnexpectedRead error variable to conn_check_dummy.go for non-unix build constraints.

---

The variable was used in common code, missing it caused build errors on non-unix systems.

go-redis/internal/pool/pool.go

Lines 808 to 810 in a44df88

	// before WithReader to ensure proper context is available to handlers
	if p.cfg.PushNotificationsEnabled && err == errUnexpectedRead {
	// we know that there is something in the buffer, so peek at the next reply type without

[jit-ci]

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[elena-kolevska]

Thanks @huiyifyj