fix: Update barretenberg to version with mutex on pedersen generators

.github/workflows/test.yml

@@ -54,7 +54,7 @@ jobs:
         with:
           repository: AztecProtocol/barretenberg
           path: barretenberg
-          ref: d104756225a72c047a6b54d453cea2d3fb0110bb
+          ref: ecb61292c96c3b1fc673bcd96920cd2f00fe28b9
 
       - name: Setup Linux environment
         if: matrix.os == 'ubuntu-latest'
@@ -87,4 +87,4 @@ jobs:
 
       - name: Run cargo test
         run: |
-          cargo test --locked -- --test-threads=1
+          cargo test --locked

README.md

@@ -22,7 +22,7 @@ to install everything globally, you'll need:
 
     Linker provided by Clang, but might need to be installed via `apt install lld`.
 
-4. `barretenberg` (preferably at commit `d104756225a72c047a6b54d453cea2d3fb0110bb`)
+4. `barretenberg` (preferably at commit `ecb61292c96c3b1fc673bcd96920cd2f00fe28b9`)
 
     Needs to be built and installed following the instructions [in the README](https://github.com/AztecProtocol/barretenberg#getting-started). Note that barretenberg has its own [dependencies](https://github.com/AztecProtocol/barretenberg#dependencies) that will need to be installed, such as `cmake` and `ninja`.
 

flake.nix

@@ -71,13 +71,6 @@
       environment = {
         # rust-bindgen needs to know the location of libclang
         LIBCLANG_PATH = "${pkgs.llvmPackages.libclang.lib}/lib";
-
-        # Barretenberg fails if tests are run on multiple threads, so we set the test thread
-        # count to 1 throughout the entire project
-        #
-        # Note: Setting this allows for consistent behavior across build and shells, but is mostly
-        # hidden from the developer - i.e. when they see the command being run via `nix flake check`
-        RUST_TEST_THREADS = "1";
       };
 
       # As per https://discourse.nixos.org/t/gcc11stdenv-and-clang/17734/7 since it seems that aarch64-linux uses