Remove version.txt creation step that incorrectly sets CDK utils version to application version

Author: kris-szlapa

.github/workflows/cdk_release_code.yml

@@ -122,9 +122,6 @@ jobs:
           SLACK_BOT_TOKEN: "${{ secrets.SLACK_BOT_TOKEN }}"
           SLACK_SIGNING_SECRET: "${{ secrets.SLACK_SIGNING_SECRET }}"
 
-      - name: Create version.txt for CDK tooling
-        run: echo "${{ inputs.VERSION_NUMBER }}" > .build/version.txt
-
       - name: Show diff
         run: |
           docker run \