fix!: upgrade ruby to 3.4

Author: reo101

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.2'
+          ruby-version: '3.4'
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
         with:

flake.nix

@@ -47,7 +47,9 @@
     in {
       default = pkgs.mkShell {
         packages = with pkgs; [
-          ruby
+          # WARNING: `3.4` needed in `./gems/codetracer-ruby-recorder/ext/native_tracer/src/lib.rs`
+          #          for the `thread` field of `rb_internal_thread_event_data_t`
+          ruby_3_4
 
           # The native extension is implemented in Rust
           (rust-toolchain-for system)