minor: post-release Cargo.toml updates

Author: kmahar

Cargo.toml

@@ -15,7 +15,7 @@ homepage = "https://www.mongodb.com/docs/drivers/rust/"
 license = "Apache-2.0"
 readme = "README.md"
 name = "mongodb"
-version = "2.3.0-beta"
+version = "2.3.0-beta.1"
 
 exclude = [
     "etc/**",
@@ -55,7 +55,7 @@ snappy-compression = ["snap"]
 async-trait = "0.1.42"
 base64 = "0.13.0"
 bitflags = "1.1.0"
-bson = "2.3.0"
+bson = { git = "https://github.com/mongodb/bson-rust", branch = "main" }
 chrono = "0.4.7"
 derivative = "2.1.1"
 flate2 = { version = "1.0", optional = true }