Switch to hexdoc-dev/actions and artifacts v4 (#836)

Author: SamsTheNerd

.github/workflows/build_docs.yml

@@ -24,7 +24,7 @@ permissions:
 
 jobs:
   hexdoc:
-    uses: hexdoc-dev/hexdoc/.github/workflows/hexdoc.yml@main
+    uses: hexdoc-dev/actions/.github/workflows/hexdoc.yml@v1
     permissions:
       contents: write
       pages: read
@@ -51,7 +51,7 @@ jobs:
       id-token: write
     steps:
       - name: Download package artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: hexdoc-build
           path: dist

.github/workflows/pr.yml

@@ -74,7 +74,7 @@ jobs:
   hexdoc:
     # don't bother running the docs build when pushing to main - nothing necessary to cache here
     if: github.event_name != 'push'
-    uses: hexdoc-dev/hexdoc/.github/workflows/hexdoc.yml@main
+    uses: hexdoc-dev/actions/.github/workflows/hexdoc.yml@v1
     permissions:
       contents: write
       pages: read