Upgrade actions/download-artifact to v4

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

.github/actions/rpm/action.yml

@@ -35,7 +35,7 @@ runs:
       shell: bash
 
     - name: Download spec
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: warewulf.spec
 
@@ -45,7 +45,7 @@ runs:
       shell: bash
 
     - name: Download dist
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: warewulf-${{ env.EXPECTED_VERSION }}.tar.gz
 
@@ -93,4 +93,4 @@ runs:
       with:
         release_id: ${{ inputs.event-id }}
         file: " warewulf-${{ env.EXPECTED_VERSION }}.tar.gz;/var/lib/mock/${{ inputs.target }}/result/${{ env.RPM }};/var/lib/mock/${{ inputs.target }}/result/${{ env.SRPM }};/var/lib/mock/${{ inputs.target }}/result/${{ env.DRACUT }}"
-        overwrite: true
+        overwrite: true