ci(release): Bump attestation GHA to 4.6.0

This consumes a feat to understand SLSA attestation predicate v1,
which is what docker buildx creates now.

Signed-off-by: Víctor Cuadrado Juan <vcuadradojuan@suse.de>

Author: viccuad

.github/workflows/release.yml

@@ -123,7 +123,7 @@ jobs:
         arch: [amd64, arm64]
     steps:
       - name: Generate and sign attestations
-        uses: kubewarden/github-actions/attestation@f1695ca9a575bf58b85d6c3652c7ff7d1d12ec24 # v4.5.16
+        uses: kubewarden/github-actions/attestation@f301a7874dd642510fff54a89e4329881bf871ef # v4.6.0
         with:
           component: ${{ matrix.component }}
           arch: ${{ matrix.arch }}