build(deps): bump once_cell from 1.19.0 to 1.20.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.19.0 to 1.20.0.
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.19.0...v1.20.0)

---
updated-dependencies:
- dependency-name: once_cell
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

swap/Cargo.toml

@@ -37,7 +37,7 @@ jsonrpsee-core = "0.16.2"
 libp2p = { version = "0.42.2", default-features = false, features = [ "tcp-tokio", "yamux", "mplex", "dns-tokio", "noise", "request-response", "websocket", "ping", "rendezvous", "identify" ] }
 monero = { version = "0.12", features = [ "serde_support" ] }
 monero-rpc = { path = "../monero-rpc" }
-once_cell = "1.19"
+once_cell = "1.20"
 pem = "3.0"
 proptest = "1"
 qrcode = "0.14"