Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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

.github/workflows/continuous-integration.yml

@@ -146,7 +146,7 @@ jobs:
         run: "vendor/bin/simple-phpunit --colors=always --testdox --testsuite churn-tests --coverage-clover=coverage.xml"
 
       - name: "Download other code coverage reports"
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: coverage
           path: ./coverage
@@ -300,7 +300,7 @@ jobs:
           tools: none
 
       - name: Download churn.phar
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: churn.phar
 
@@ -342,7 +342,7 @@ jobs:
           tools: none
 
       - name: Download churn.phar
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: churn.phar