Fix release workflow.

Author: Cossey

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Check out code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
@@ -153,7 +153,7 @@ jobs:
     runs-on: macOS-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Setup R
         uses: r-lib/actions/setup-r@v2
       - name: Setup Pandoc
@@ -175,7 +175,7 @@ jobs:
           cd Help
           Rscript -e "bookdown::render_book('index.Rmd', 'bookdown::pdf_book', params = list(version = '${{ github.event.milestone.title }}'))"
       - name: Upload artifact
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: Help
           path: Help/_book/