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chore: update to quic-go@v0.40.1 (#1428)

Upgrade to quic-go@v0.40.1 and adapt closing policy after [changes in
quic-go@v0.40.0](https://github.com/quic-go/quic-go/releases/tag/v0.40.0)
and https://github.com/quic-go/quic-go/pull/4072 in particular. We're
creating an UDP conn and [passing it to
server.Serve](https://github.com/ooni/probe-cli/pull/1428/files#diff-efda3daa51fe894a3c850d533179c2425R105),
which [calls
serveConn](https://github.com/quic-go/quic-go/blob/v0.40.1/http3/server.go#L242),
which [calls
quicListen](https://github.com/quic-go/quic-go/blob/v0.40.1/http3/server.go#L316)
and then
[ServeListener](https://github.com/quic-go/quic-go/blob/v0.40.1/http3/server.go#L321).
In turn, ServeListener [is interrupted by
ErrServerClosed](https://github.com/quic-go/quic-go/blob/v0.40.1/http3/server.go#L268),
which seems to be generated by [server.Close calling Close for each
listener](https://github.com/quic-go/quic-go/blob/v0.40.1/http3/server.go#L657).
The following is what happened before updating the shutdown protocol:

```
goroutine 247 [sync.Mutex.Lock]:

[...]

github.com/quic-go/quic-go.(*Transport).closeServer(0x1400054a000?)
	/Users/sbs/go/pkg/mod/github.com/quic-go/quic-go@v0.40.0/transport.go:298 +0x90

github.com/quic-go/quic-go.(*baseServer).close.func1()
	/Users/sbs/go/pkg/mod/github.com/quic-go/quic-go@v0.40.0/server.go:344 +0x84

[...]

github.com/quic-go/quic-go.(*baseServer).close(0x14000cc1c10?, {0x102faa7a0?, 0x140002557b0?}, 0xec?)
	/Users/sbs/go/pkg/mod/github.com/quic-go/quic-go@v0.40.0/server.go:338 +0x64

github.com/quic-go/quic-go.(*baseServer).Close(...)
	/Users/sbs/go/pkg/mod/github.com/quic-go/quic-go@v0.40.0/server.go:333

github.com/quic-go/quic-go.(*EarlyListener).Close(0x14000120700?)
	/Users/sbs/go/pkg/mod/github.com/quic-go/quic-go@v0.40.0/server.go:165 +0x34

github.com/quic-go/quic-go/http3.(*Server).Close(0x140007344d0)
	/Users/sbs/go/pkg/mod... (continued)

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Source Files on job 0 - 7192721681.1