chore(deps): remove go-libp2p fork replace and bump to v0.48.0 (#385)

## Summary
- Remove the `replace` directive for `github.com/libp2p/go-libp2p`
pointing to `celestiaorg/go-libp2p` fork
- Bump `go-libp2p` from v0.46.0 to upstream v0.48.0 (fork changes have
been upstreamed)

Closes:
https://linear.app/celestia/issue/PROTOCO-1352/remove-go-libp2p-fork-replace-directive

## Test plan
- [x] `go build ./...` passes
- [x] `go test ./...` passes

Author: walldiss

go.mod

@@ -1,6 +1,6 @@
 module github.com/celestiaorg/go-header
 
-go 1.25.0
+go 1.25.7
 
 // History unavailable and was rewritten DO NOT USE
 retract v0.1.0
@@ -11,17 +11,19 @@ require (
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/ipfs/go-datastore v0.9.0
 	github.com/ipfs/go-log/v2 v2.9.0
-	github.com/libp2p/go-libp2p v0.46.0
+	github.com/libp2p/go-libp2p v0.48.0
 	github.com/libp2p/go-libp2p-pubsub v0.15.0
 	github.com/stretchr/testify v1.11.1
 	go.opentelemetry.io/otel v1.38.0
 	go.opentelemetry.io/otel/metric v1.38.0
 	go.opentelemetry.io/otel/trace v1.38.0
 	go.uber.org/zap v1.27.1
-	golang.org/x/crypto v0.46.0
+	golang.org/x/crypto v0.48.0
 )
 
 require (
+	filippo.io/bigmod v0.1.1-0.20260103110540-f8a47775ebe5 // indirect
+	filippo.io/keygen v0.0.0-20260114151900-8e2790ea4c5b // indirect
 	github.com/benbjohnson/clock v1.3.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
@@ -43,7 +45,7 @@ require (
 	github.com/libp2p/go-flow-metrics v0.2.0 // indirect
 	github.com/libp2p/go-libp2p-asn-util v0.4.1 // indirect
 	github.com/libp2p/go-msgio v0.3.0 // indirect
-	github.com/libp2p/go-netroute v0.3.0 // indirect
+	github.com/libp2p/go-netroute v0.4.0 // indirect
 	github.com/libp2p/go-reuseport v0.4.0 // indirect
 	github.com/libp2p/go-yamux/v5 v5.0.1 // indirect
 	github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd // indirect
@@ -65,21 +67,18 @@ require (
 	github.com/multiformats/go-varint v0.1.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pion/datachannel v1.5.10 // indirect
-	github.com/pion/dtls/v2 v2.2.12 // indirect
-	github.com/pion/dtls/v3 v3.0.11 // indirect
+	github.com/pion/dtls/v3 v3.1.2 // indirect
 	github.com/pion/ice/v4 v4.0.10 // indirect
 	github.com/pion/interceptor v0.1.40 // indirect
 	github.com/pion/logging v0.2.4 // indirect
 	github.com/pion/mdns/v2 v2.0.7 // indirect
 	github.com/pion/randutil v0.1.0 // indirect
-	github.com/pion/rtcp v1.2.15 // indirect
+	github.com/pion/rtcp v1.2.16 // indirect
 	github.com/pion/rtp v1.8.19 // indirect
 	github.com/pion/sctp v1.8.39 // indirect
-	github.com/pion/sdp/v3 v3.0.13 // indirect
+	github.com/pion/sdp/v3 v3.0.18 // indirect
 	github.com/pion/srtp/v3 v3.0.6 // indirect
-	github.com/pion/stun v0.6.1 // indirect
-	github.com/pion/stun/v3 v3.0.0 // indirect
-	github.com/pion/transport/v2 v2.2.10 // indirect
+	github.com/pion/stun/v3 v3.1.1 // indirect
 	github.com/pion/transport/v3 v3.0.7 // indirect
 	github.com/pion/transport/v4 v4.0.1 // indirect
 	github.com/pion/turn/v4 v4.0.2 // indirect
@@ -97,18 +96,16 @@ require (
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/exp v0.0.0-20251209150349-8475f28825e9 // indirect
-	golang.org/x/mod v0.31.0 // indirect
-	golang.org/x/net v0.48.0 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/net v0.50.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.39.0 // indirect
-	golang.org/x/text v0.32.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
-	golang.org/x/tools v0.40.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/blake3 v1.4.1 // indirect
 )
 
-replace github.com/libp2p/go-libp2p => github.com/celestiaorg/go-libp2p v0.0.0-20260305152434-2746e4a3d852
-
 replace github.com/libp2p/go-libp2p-pubsub => github.com/celestiaorg/go-libp2p-pubsub v0.6.2-0.20260225133553-213565e2a428