chore(deps): bump once_cell from 1.19.0 to 1.20.0 (#896)

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

Cargo.toml

@@ -37,7 +37,7 @@ sp-runtime = "39.0.0"
 # prometheus
 prometheus = "0.13"
 hyper = { version = "0.14.30", features = ["server", "http1", "http2", "tcp"] }
-once_cell = "1.19"
+once_cell = "1.20"
 
 [dev-dependencies]
 anyhow = "1"