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/build.yml

@@ -100,7 +100,7 @@ jobs:
 
     steps:
     - name: Download artifacts
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: test-reports-java${{ needs.test.outputs.report-java }}-${{ needs.test.outputs.report-dist }}-xml
 

.github/workflows/release-verify-signatures.yml

@@ -68,7 +68,7 @@ jobs:
         done
 
     - name: Retrieve keyring and signatures
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: keyring-and-signatures
 
@@ -87,7 +87,7 @@ jobs:
 
     steps:
     - name: Retrieve signatures
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: keyring-and-signatures