Bump once_cell from 1.11.0 to 1.12.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.11.0...v1.12.0)

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

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

plume-models/Cargo.toml

@@ -31,7 +31,7 @@ glob = "0.3.0"
 lindera-tantivy = { version = "0.7.1", optional = true }
 tracing = "0.1.34"
 riker = "0.4.2"
-once_cell = "1.11.0"
+once_cell = "1.12.0"
 lettre = "0.9.6"
 native-tls = "0.2.10"
 activitystreams = "0.7.0-alpha.18"