Use latest Miniconda and conda for CI setup

Signed-off-by: Marcel Bargull <marcel.bargull@udo.edu>

.github/workflows/main.yml

@@ -16,17 +16,18 @@ jobs:
       uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - uses: conda-incubator/setup-miniconda@v2.1.1
+    - uses: conda-incubator/setup-miniconda@v2
       with:
         auto-update-conda: false
-        miniconda-version: py37_4.10.3
         auto-activate-base: true
         activate-environment: ""
     - name: Install build dependencies
       shell: bash -l {0}
       run: |
         conda config --append channels conda-forge
-        conda install -y conda-build conda-verify flake8 pydocstyle yapf==0.30.0 sphinx sphinx_rtd_theme
+        # TODO: solver=libmamba is default for conda>=23.10 and thus can be removed for future Miniconda versions.
+        CONDA_SOLVER=libmamba \
+        conda install -y conda\>=23.10 conda-build conda-verify flake8 pydocstyle yapf==0.30.0 sphinx sphinx_rtd_theme
     - name: Verify formatting compliance
       shell: bash -l {0}
       run: |