update nightly toolchain

Summary: Upgrading the `ocaml` OSS Rust toolchain to match `buck2`'s version

Reviewed By: dtolnay

Differential Revision: D53895769

fbshipit-source-id: d487cdf9ef732b5433ca28ee333df70cb52a1b12

vendor/ocaml/interop/.circleci/config.yml

@@ -9,7 +9,7 @@ commands:
       - run:
           name: Download rust
           command: |
-            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain nightly-2023-07-10 -y
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain nightly-2023-12-11 -y
 
   init_opam:
     description: Initialize opam

vendor/ocaml/interop/oss/README-BUCK.md

@@ -17,7 +17,7 @@ Valid values for `$PLAT` are `x86_64-unknown-linux-gnu` on Linux, `x86_64-apple-
 
 It's also possible to install Buck2 from source into `~/.cargo/bin` like this.
 ```bash
-  cargo +nightly-2023-06-27 install --git https://github.com/facebook/buck2.git buck2
+  cargo +nightly-2023-12-11 install --git https://github.com/facebook/buck2.git buck2
 ```
 *Note: If on aarch64-apple-darwin then be sure install to `brew install protobuf` and for the now it's necessary to add
 ```bash
@@ -30,7 +30,7 @@ to the build environment.*
 
 Install the `reindeer` binary from source into '~/.cargo/bin' like this.
 ```bash
-    cargo +nightly-2023-06-27 install --git https://github.com/facebookincubator/reindeer.git reindeer
+    cargo +nightly-2023-12-11 install --git https://github.com/facebookincubator/reindeer.git reindeer
 ```
 
 *Note: Make sure after installing Buck2 and Reindeer to configure your `PATH` environment variable if necessary so they can be found.*