[ci] Bump peter-evans/create-pull-request from 7 to 8 (#249)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Frédéric Samier <frederic.samier@ledger.fr>

Author: dependabot[bot]

.github/workflows/update_submodules.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Create pull request
         if: ${{ !cancelled() && steps.changes.outputs.changes == 'true' }}
         timeout-minutes: 10
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@v8
         with:
           token: ${{ secrets.CI_BOT_TOKEN }}
           author: ${{ secrets.CI_BOT_USERNAME }} <${{ secrets.CI_BOT_USERNAME }}@users.noreply.github.com>