Fix: [AEA-0000] - satisfies changeset naming (#904)

## Summary

- Routine Change

### Details

fixes validation failure caused by regex during deploy 
see failing pipeline:

https://github.com/NHSDigital/eps-vpc-resources/actions/runs/22395527842/job/64829794154

Author: bencegadanyi1-nhs

.github/workflows/cdk_release_code.yml

@@ -146,7 +146,8 @@ jobs:
 
       - name: "Run create changeset for cdk app ${{ inputs.CDK_APP_NAME }} stack ${{ inputs.DEPLOYED_STACK_NAME }} new tag"
         run: |
-          CDK_CHANGE_SET_NAME="${CDK_CONFIG_DEPLOYED_STACK_NAME}-changeset-${CDK_CONFIG_versionNumber}-$(date +%s)"
+          SANITIZED_VERSION="${CDK_CONFIG_versionNumber//./-}"
+          CDK_CHANGE_SET_NAME="${CDK_CONFIG_DEPLOYED_STACK_NAME}-changeset-${SANITIZED_VERSION}-$(date +%s)"
           export CDK_CHANGE_SET_NAME
           echo "CDK_CHANGE_SET_NAME=${CDK_CHANGE_SET_NAME}" >> "$GITHUB_ENV"
           echo "Created changeset ${CDK_CHANGE_SET_NAME} for app ${CDK_APP_NAME} stack ${CDK_CONFIG_DEPLOYED_STACK_NAME}" >> "$GITHUB_STEP_SUMMARY"