remove micromamba

.github/workflows/tests.yml

@@ -5,38 +5,31 @@ on:
   push:
     branches: [main]
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   run:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         python-version: [ "3.9", "3.10", "3.11", "3.12" ]
         os: [ windows-latest, ubuntu-latest, macos-latest ]
-        # Oldest one based on NEP-29 and latest one.
-        # See https://numpy.org/neps/nep-0029-deprecation_policy.html
-        numpy-version: ["1.23", "1.26"]
-        exclude:
-          - python-version: "3.12"
-            numpy-version: "1.23"
       fail-fast: false
-    defaults:
-      run:
-        shell: bash -l {0}
 
     steps:
     - uses: actions/checkout@v4
 
-    - name: Setup Micromamba Python ${{ matrix.python-version }} numpy ${{ matrix.numpy-version }}
-      uses: mamba-org/setup-micromamba@v2
+    - name: Set up Python
+      uses: actions/setup-python@v5
       with:
-        environment-name: TEST
-        init-shell: bash
-        create-args: >-
-          python=${{ matrix.python-version }} python-build numpy=${{ matrix.numpy-version }} --file requirements-dev.txt --channel conda-forge
+        python-version: ${{ matrix.python-version }}
 
     - name: Install gsw
-      run: |
-        python -m pip install -e . --no-deps --force-reinstall
+      run: >
+        python -m pip install -r requirements-dev.txt
+        && python -m pip install -e .
 
     - name: Tests
       run: |