Update mongodb requirement from 2.7.0 to 3.0.1

Updates the requirements on [mongodb](https://github.com/mongodb/mongo-rust-driver) to permit the latest version.
- [Release notes](https://github.com/mongodb/mongo-rust-driver/releases)
- [Commits](mongodb/mongo-rust-driver@v2.7.0...v3.0.1)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-type: direct:production
...

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

mongodb-store/Cargo.toml

@@ -15,7 +15,7 @@ readme = "README.md"
 [dependencies]
 async-trait = "0.1.77"
 bson = { version = "2.7.0", features = ["time-0_3"] }
-mongodb = { version = "2.7.0" }
+mongodb = { version = "3.0.1" }
 rmp-serde = "1.1.2"
 serde = "1.0.195"
 thiserror = "1.0.56"