v1.6: revert libp2p upgrade changes from #5961 (#6017)

## Motivation

Newer versions of libp2p has bugs introduced in libp2p/go-libp2p#2793 which break observed address handling for connections which are closed too early.

fetch/fetch.go

@@ -294,12 +294,12 @@ func NewFetch(
 		}
 		host.Network().Notify(&network.NotifyBundle{
 			ConnectedF: func(_ network.Network, c network.Conn) {
-				if !c.Stat().Limited {
+				if !c.Stat().Transient {
 					connectedf(c.RemotePeer())
 				}
 			},
 			DisconnectedF: func(_ network.Network, c network.Conn) {
-				if !c.Stat().Limited && !host.Connected(c.RemotePeer()) {
+				if !c.Stat().Transient && !host.Connected(c.RemotePeer()) {
 					f.logger.With().Debug("remove peer", log.Stringer("id", c.RemotePeer()))
 					f.peers.Delete(c.RemotePeer())
 				}

go.mod

@@ -20,9 +20,9 @@ require (
 	github.com/ipfs/go-ds-leveldb v0.5.0
 	github.com/ipfs/go-log/v2 v2.5.1
 	github.com/jonboulle/clockwork v0.4.0
-	github.com/libp2p/go-libp2p v0.34.0
+	github.com/libp2p/go-libp2p v0.33.2
 	github.com/libp2p/go-libp2p-kad-dht v0.25.2
-	github.com/libp2p/go-libp2p-pubsub v0.11.0
+	github.com/libp2p/go-libp2p-pubsub v0.10.0
 	github.com/libp2p/go-libp2p-record v0.2.0
 	github.com/libp2p/go-msgio v0.3.0
 	github.com/libp2p/go-yamux/v4 v4.0.1
@@ -34,7 +34,7 @@ require (
 	github.com/prometheus/client_golang v1.19.1
 	github.com/prometheus/client_model v0.6.1
 	github.com/prometheus/common v0.54.0
-	github.com/quic-go/quic-go v0.44.0
+	github.com/quic-go/quic-go v0.42.0
 	github.com/rs/cors v1.11.0
 	github.com/santhosh-tekuri/jsonschema/v5 v5.3.1
 	github.com/seehuhn/mt19937 v1.0.0
@@ -177,28 +177,12 @@ require (
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
-	github.com/pion/datachannel v1.5.6 // indirect
-	github.com/pion/dtls/v2 v2.2.11 // indirect
-	github.com/pion/ice/v2 v2.3.24 // indirect
-	github.com/pion/interceptor v0.1.29 // indirect
-	github.com/pion/logging v0.2.2 // indirect
-	github.com/pion/mdns v0.0.12 // indirect
-	github.com/pion/randutil v0.1.0 // indirect
-	github.com/pion/rtcp v1.2.14 // indirect
-	github.com/pion/rtp v1.8.6 // indirect
-	github.com/pion/sctp v1.8.16 // indirect
-	github.com/pion/sdp/v3 v3.0.9 // indirect
-	github.com/pion/srtp/v2 v2.0.18 // indirect
-	github.com/pion/stun v0.6.1 // indirect
-	github.com/pion/transport/v2 v2.2.5 // indirect
-	github.com/pion/turn/v2 v2.1.6 // indirect
-	github.com/pion/webrtc/v3 v3.2.40 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/polydawn/refmt v0.89.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
 	github.com/quic-go/qpack v0.4.0 // indirect
-	github.com/quic-go/webtransport-go v0.8.0 // indirect
+	github.com/quic-go/webtransport-go v0.6.0 // indirect
 	github.com/raulk/go-watchdog v1.3.0 // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect