Enable testing on 3.8 and 3.9 for macOS arm64 (#4041)

Author: agriyakhetarpal

.github/workflows/run_periodic_tests.yml

@@ -44,17 +44,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-12, windows-latest]
+        os: [ubuntu-latest, macos-12, macos-14, windows-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12"]
-        # Include macOS M1 runners
-        include:
-          - os: macos-14
-            python-version: "3.10"
-          - os: macos-14
-            python-version: "3.11"
-          - os: macos-14
-            python-version: "3.12"
-
     steps:
       - name: Check out PyBaMM repository
         uses: actions/checkout@v4

.github/workflows/test_on_push.yml

@@ -36,20 +36,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-12, windows-latest]
+        os: [ubuntu-latest, macos-12, macos-14, windows-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12"]
         # We check coverage on Ubuntu with Python 3.12, so we skip unit tests for it here
         exclude:
           - os: ubuntu-latest
             python-version: "3.12"
-        # Include macOS M1 runners
-        include:
-          - os: macos-14
-            python-version: "3.10"
-          - os: macos-14
-            python-version: "3.11"
-          - os: macos-14
-            python-version: "3.12"
     name: Unit tests (${{ matrix.os }} / Python ${{ matrix.python-version }})
 
     steps:
@@ -184,18 +176,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-12, windows-latest]
+        os: [ubuntu-latest, macos-12, macos-14, windows-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12"]
-        # Include macOS M1 runners
-        include:
-          - os: macos-14
-            python-version: "3.10"
-          - os: macos-14
-            python-version: "3.11"
-          - os: macos-14
-            python-version: "3.12"
     name: Integration tests (${{ matrix.os }} / Python ${{ matrix.python-version }})
-
     steps:
       - name: Check out PyBaMM repository
         uses: actions/checkout@v4