Update build-and-publish.yml

Addressing workflow warnings about deprecated commands and workflows.

.github/workflows/build-and-publish.yml

@@ -20,11 +20,11 @@ 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/checkout@v4
 
       - name: Get current date
         id: date
-        run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
+        run: echo "name=date::$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
 
       # Runs a set of commands using the runners shell
       - name: Install LaTex Dependencies