fix(lib): remove deprecated net.Error.Temporary() from the proxy accept loop

[0xrlawrence]

Description

net.Error.Temporary() has been deprecated since Go 1.18 because its semantics are not well defined. staticcheck reports it as SA1019.

In this accept loop the call was also dead code. Both branches did exactly the same thing — log a warning, sleep 50ms, continue — differing only in the wording of the log line:

if ne, ok := err.(net.Error); ok && ne.Temporary() {
    p.log.Warnf("validator tcp proxy temporary accept error on port %d: %v", port, err)
    time.Sleep(50 * time.Millisecond)
    continue
}
p.log.Warnf("validator tcp proxy accept error on port %d: %v", port, err)
time.Sleep(50 * time.Millisecond)
continue

Deliberate shutdown is already handled by the ctx.Done() check immediately above.

Changes Made

• Collapsed to the single retry path and dropped the deprecated call.

Testing

• go build ./...
• go test ./lib/ passes
• staticcheck no longer reports SA1019 at lib/peer.go:542

No behaviour change beyond one log message no longer being labelled "temporary".

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