Don't include webrtc into the tokio feature

This works around a bug in cargo which unconditionally pulls the
dependencies even if the `webrtc` feature is not enabled and causes
issues in downstream with other conflicting dependencies.

libp2p/CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.51.4
+
+- Don't include `webrtc` into `tokio` by default [PR 4962].
+
+[PR 4962]: https://github.com/libp2p/rust-libp2p/pull/4962
+
 ## 0.51.3
 
 - Deprecate the `mplex` feature.

libp2p/Cargo.toml

@@ -80,12 +80,12 @@ secp256k1 = ["libp2p-identity/secp256k1"]
 serde = ["libp2p-core/serde", "libp2p-kad?/serde", "libp2p-gossipsub?/serde"]
 tcp = ["dep:libp2p-tcp"]
 tls = ["dep:libp2p-tls"]
-tokio = ["libp2p-swarm/tokio", "libp2p-mdns?/tokio", "libp2p-tcp?/tokio", "libp2p-dns?/tokio", "libp2p-quic?/tokio", "libp2p-webrtc?/tokio"]
+tokio = ["libp2p-swarm/tokio", "libp2p-mdns?/tokio", "libp2p-tcp?/tokio", "libp2p-dns?/tokio", "libp2p-quic?/tokio"]
 uds = ["dep:libp2p-uds"]
 wasm-bindgen = ["futures-timer/wasm-bindgen", "instant/wasm-bindgen", "getrandom/js", "libp2p-swarm/wasm-bindgen"]
 wasm-ext = ["dep:libp2p-wasm-ext"]
 wasm-ext-websocket = ["wasm-ext", "libp2p-wasm-ext?/websocket"]
-webrtc = ["dep:libp2p-webrtc", "libp2p-webrtc?/pem"]
+webrtc = ["dep:libp2p-webrtc", "libp2p-webrtc?/pem", "libp2p-webrtc/tokio"]
 websocket = ["dep:libp2p-websocket"]
 yamux = ["dep:libp2p-yamux"]