Update checkout action version to v5

Author: magicdude4eva

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

@@ -22,7 +22,7 @@ jobs:
       contents: write    # to create GitHub releases
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Detect latest Fulcrum version
         id: latest