Upgrade GitHub Actions and Python version in workflow

Updated actions versions and Python version in workflow.

Author: mrdbourke

.github/workflows/make_docs.yml

@@ -1,15 +1,12 @@
 name: make_docs
-
 # Controls when the action will run. 
 on:
   # Triggers the workflow on push or pull request events but only for the main branch
   push:
     branches: 
        - main
-
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
-
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
@@ -20,11 +17,11 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: 3.8
-      - uses: actions/cache@v2
+          python-version: '3.12'
+      - uses: actions/cache@v4
         with:
           key: ${{ github.ref }}
           path: .cache