Fix minor issues in the build-gcpy-environment.yml file

.github/workflows/build-gcpy-environment.yml
- Use [email protected] (the latest version)
- Import gcpy, not numpy

Signed-off-by: Bob Yantosca <[email protected]>

.github/workflows/build-gcpy-environment.yml

@@ -11,23 +11,23 @@ on:
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [ "main", "dev" ]
-
+    
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.9"]
     steps:
-      - uses: mamba-org/setup-micromamba@v1
+      - uses: mamba-org/setup-micromamba@v1.8.0
         with:
           micromamba-version: 'latest'
           environment-file: docs/source/environment.yml
           init-shell: bash
           cache-environment: true
           post-cleanup: 'all'
       - name: Import gcpy in micromamba environment (bash)
-        run: python -c "import numpy"
+        run: python -c "import gcpy"
         shell: bash -el {0}
       - name: Run custom command in micromamba environment
         run: python -m gcpy.examples.plotting.create_test_plot