build(deps): Update rmp-serde requirement from 0.15 to 1.0 (#2439)

Updates the requirements on [rmp-serde](https://github.com/3Hren/msgpack-rust) to permit the latest version.
- [Release notes](https://github.com/3Hren/msgpack-rust/releases)
- [Commits](3Hren/msgpack-rust@rmp-serde/v0.15.0...rmp-serde/v1.0.0)

---
updated-dependencies:
- dependency-name: rmp-serde
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

core/Cargo.toml

@@ -50,7 +50,7 @@ libp2p-mplex = { path = "../muxers/mplex" }
 libp2p-noise = { path = "../transports/noise" }
 libp2p-tcp = { path = "../transports/tcp" }
 serde_json = "1.0"
-rmp-serde = "0.15"
+rmp-serde = "1.0"
 multihash = { version = "0.14", default-features = false, features = ["arb"] }
 quickcheck = "0.9.0"
 rand07 = { package = "rand", version = "0.7" }