chore(deps): bump actions/download-artifact from 4.1.9 to 4.3.0 (ietf-tools#8849)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4.1.9 to 4.3.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4.1.9...v4.3.0)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -185,7 +185,7 @@ jobs:
 
     - name: Download a Coverage Results
       if: ${{ github.event.inputs.skiptests == 'false' || github.ref_name == 'release' }}
-      uses: actions/download-artifact@v4.1.9
+      uses: actions/download-artifact@v4.3.0
       with:
         name: coverage
 
@@ -292,7 +292,7 @@ jobs:
 
     - name: Download Coverage Results
       if: ${{ github.event.inputs.skiptests == 'false' || github.ref_name == 'release' }}
-      uses: actions/download-artifact@v4.1.9
+      uses: actions/download-artifact@v4.3.0
       with:
         name: coverage
 
@@ -407,7 +407,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Download a Release Artifact
-      uses: actions/download-artifact@v4.1.9
+      uses: actions/download-artifact@v4.3.0
       with:
         name: release-${{ env.PKG_VERSION }}