Fix doctests failures in scheduled tests (#3784)

Closes #3781

Author: agriyakhetarpal

.github/workflows/run_periodic_tests.yml

@@ -49,7 +49,11 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@v4
+      - name: Check out PyBaMM repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: