Attempt at mutli-Python CI

Updated dependencies to allow for 3.9-3.11
Updated dependencies to not require specific versions of other packages
Updated unit-test.yml to run under 3.9, 3.10 and 3.11

.github/workflows/unit-test.yml

@@ -7,6 +7,9 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.9, 3.10, 3.11]
 
     steps:
     - uses: actions/checkout@v3
@@ -15,7 +18,7 @@ jobs:
       with:
         activate-environment: onair
         environment-file: environment.yml
-        python-version: 3.11.2
+        python-version: ${{ matrix.python-version }}
         auto-activate-base: false
     - name: Install dependencies
       shell: bash -l {0}

environment.yml

@@ -3,12 +3,12 @@ channels:
   - default
   - conda-forge
 dependencies:
-  - python==3.11.2
-  - numpy==1.23.4
-  - coverage==6.5.0
-  - pytest==7.2.0
-  - pytest-mock==3.10.0
-  - pytest-randomly==3.12.0
+  - python>=3.9,<3.12
+  - numpy
+  - coverage
+  - pytest
+  - pytest-mock
+  - pytest-randomly
   - pip
   - pip:
-    - redis==4.6.0
+    - redis