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]>

.github/workflows/build.yaml

@@ -441,7 +441,7 @@ jobs:
         sudo apt upgrade
         sudo apt install lcov
     - name: Download test results
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: test-results-combined
         path: ${{ runner.temp }}/artifacts
@@ -488,7 +488,7 @@ jobs:
     - name: Clear previous coverage report
       run: rm -rf main/cov
     - name: Download HTML report
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: coverage-report
         path: main/cov

.github/workflows/docs.yaml

@@ -48,12 +48,12 @@ jobs:
     - name: Clear previous docs
       run: rm -rf main/{doc,int}
     - name: Download public docs
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: public-docs
         path: main/doc
     - name: Download internal docs
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: internal-docs
         path: main/int