action: manifest: Update to v1.7.0

See the following PR for more info on what changed since v1.6.0:
zephyrproject-rtos/action-manifest#16

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

Author: carlescufi

.github/workflows/manifest.yml

@@ -31,7 +31,7 @@ jobs:
           west update zephyr
 
       - name: Manifest
-        uses: zephyrproject-rtos/action-manifest@v1.6.0
+        uses: zephyrproject-rtos/action-manifest@v1.7.0
         with:
           github-token: ${{ secrets.NCS_GITHUB_TOKEN }}
           manifest-path: 'west.yml'