Update pull.yml

actually update actions/upload-artifact to v4

Author: csiblock

.github/workflows/pull.yml

@@ -18,15 +18,15 @@ 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@v4
+      - uses: actions/checkout@v2
 
       # The same command that users can use locally is used to build documentation.
       - name: Build documentation
         run: make
 
       # Publish generated site as artifact. Unfortunately viewing it requires
       # downloading a .zip and uncompressing that (https://github.com/actions/upload-artifact/issues/14#issuecomment-620728238)
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: html-docs
           path: docs