fix: missing checkout step in sbom generation (#713)

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## This PR

SBOM generation failed because I forgot the checkout step.
This adds it.

Signed-off-by: Lukas Reining <[email protected]>
Co-authored-by: Michael Beemer <[email protected]>

Author: lukas-reining

.github/workflows/release-please.yml

@@ -33,6 +33,8 @@ jobs:
     env:
       TAG: ${{ fromJSON(needs.release-please.outputs.all)[format('{0}--tag_name', matrix.release)] }}
     steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
       - name: Setup Node
         uses: actions/setup-node@v4
         with: