Pin conda-build version in CI. (#442)

* Pin conda-build version in CI.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/conda.yaml

@@ -41,8 +41,9 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: install conda build
+        # TODO pinning conda-build version because it stopped working for no good reason in 3.25 or 3.26.
         run: |
-          mamba install -y conda-build conda-verify
+          mamba install -y conda-build=3.24.0 conda-verify
         shell: bash
 
       - name: build and test package