fix driver compilation (#24)

Author: abr-egn

mongocrypt/Cargo.toml

@@ -18,7 +18,7 @@ compile_fail = []
 
 [dependencies]
 mongocrypt-sys = "0.1.1"
-bson = "2.6.0"
+bson = { git = "https://github.com/mongodb/bson-rust", branch = "main" }
 serde = "1.0.125"
 once_cell = "1.17.0"