[CI] Fix test environment. (#10609)

* [CI] Fix test environment.

* Remove shell.

* Remove.

* Update Dockerfile.i386

.github/workflows/i386.yml

@@ -23,7 +23,7 @@ jobs:
       with:
         submodules: 'true'
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      uses: docker/setup-buildx-action@v3.4.0
       with:
         driver-opts: network=host
     - name: Build and push container

tests/ci_build/Dockerfile.i386

@@ -1,7 +1,7 @@
 FROM i386/debian:sid
 
 ENV DEBIAN_FRONTEND noninteractive
-SHELL ["/bin/bash", "-c"]   # Use Bash as shell
+SHELL ["/bin/bash", "-c"]
 
 RUN \
     apt-get update && \

tests/ci_build/conda_env/macos_cpu_test.yml

@@ -38,4 +38,3 @@ dependencies:
 - cloudpickle
 - pip:
   - sphinx_rtd_theme
-  - py-ubjson