Update Github actions to new versions and runon Python 3.8+.

.github/workflows/runtests.yml

@@ -1,43 +1,37 @@
 name: Run tests and build docs
-
 on:
   push:
     branches: master
   pull_request:
     branches: master
-
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10']
-
+        python: ['3.8', '3.9', '3.10', '3.11', '3.12']
     steps:
-    - uses: actions/checkout@v2
-
+    - name: Set up Git repository
+      uses: actions/checkout@v4
     - name: Install Conda environment with Micromamba
-      uses: mamba-org/provision-with-micromamba@main
+      uses: conda-incubator/setup-miniconda@v3
       with:
-        cache-downloads: true
-        cache-env: true
+        auto-update-conda: true
+        python-version: ${{ matrix.python }}
         environment-file: yeadon-dev-env.yml
-        environment-name: yeadon-dev
-        extrax-specs: |
-          python=${{ matrix.python }}
-
+        activate-environment: yeadon-dev
+        miniforge-version: latest
     - name: Run the tests
       shell: bash -l {0}
       run: |
         nosetests -v --with-coverage --cover-package=yeadon
-
     - name: Build the documentation
       shell: bash -l {0}
       run: |
         cd doc && make html
-
     - name: Install the software
       shell: bash -l {0}
       run: |
         python setup.py install
+        yeadon -h