chore(deps): upgrade actions/download-artifact to v4 (#4762)

LOL. Version 3 is now [deprecated](https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/)

---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

Author: kaizencc

.github/workflows/gh-pages.yml

@@ -59,7 +59,7 @@ jobs:
           ref: gh-pages
           token: ${{ secrets.PROJEN_GITHUB_TOKEN }}
       - name: Download Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: doc-site
           path: ${{ runner.temp }}/site

.github/workflows/main.yml

@@ -289,7 +289,7 @@ jobs:
     steps:
       # Check out the code
       - name: Download Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: built-tree
       - name: Extract Artifact
@@ -385,7 +385,7 @@ jobs:
     steps:
       # Check out the code
       - name: Download Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: release-package
           path: ${{ runner.temp }}/release-package

.github/workflows/yarn-upgrade.yml

@@ -123,7 +123,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Download patch
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: upgrade.patch
           path: ${{ runner.temp }}