Pin conda-build to most recent working version

Works around issues with lief that cause failures after build completes with the message
```
AttributeError: module 'lief._lief.ELF' has no attribute 'ELF_CLASS'
```

.github/workflows/conda-package.yml

@@ -47,7 +47,8 @@ jobs:
       - name: Add conda to system path
         run: echo $CONDA/bin >> $GITHUB_PATH
       - name: Install conda-build
-        run: conda install conda-build -c conda-forge --override-channels
+        # FIXME: unpin when conda-build fixes issues with lief
+        run: conda install conda-build"<=24.11.2" -c conda-forge --override-channels
       - name: Store conda paths as envs
         shell: bash -l {0}
         run: |
@@ -96,9 +97,10 @@ jobs:
           python-version: ${{ matrix.python }}
 
       - name: Install conda build
+        # FIXME: unpin when conda-build fixes issues with lief
         run: |
           conda activate
-          conda install -y conda-build
+          conda install -y conda-build"<=24.11.2"
           conda list -n base
 
       - name: Cache conda packages