CI: Freeze version of bloaty for NuttX compilation (#3756)

Fix the compilation error of this CI:
https://github.com/bytecodealliance/wasm-micro-runtime/actions/runs/10575515238

```
/__w/wasm-micro-runtime/wasm-micro-runtime/bloaty/third_party/abseil-cpp/absl/debugging/failure_signal_handler.cc:139:32: error: no matching function for call to 'max(long int, int)'
  139 |   size_t stack_size = (std::max(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
      |                        ~~~~~~~~^~~~~~~~~~~~~~~~~
```

Author: no1wudi

.github/workflows/compilation_on_nuttx.yml

@@ -124,6 +124,7 @@ jobs:
           repository: google/bloaty
           submodules: recursive
           path: bloaty
+          ref: 34f4a66559ad4938c1e629e9b5f54630b2b4d7b0
 
       - name: Build Bloaty
         run: |