Bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/deployment.yml

@@ -153,7 +153,7 @@ jobs:
           sudo sed -i 's/^.*policy.*coder.*none.*PDF.*//' /etc/ImageMagick-6/policy.xml
 
       - name: Download built Phar file
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: wp-cli-phar
 
@@ -201,7 +201,7 @@ jobs:
           token: ${{ secrets.ACTIONS_BOT }}
 
       - name: Download WP-CLI version
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: cli_version
 
@@ -210,7 +210,7 @@ jobs:
           cat cli_version.txt > phar/NIGHTLY_VERSION
 
       - name: Download built Phar file
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: wp-cli-phar
 
@@ -265,7 +265,7 @@ jobs:
           token: ${{ secrets.ACTIONS_BOT }}
 
       - name: Download built Phar file
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: wp-cli-phar
 
@@ -319,7 +319,7 @@ jobs:
           token: ${{ secrets.ACTIONS_BOT }}
 
       - name: Download built Phar file
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: wp-cli-phar