SSCSSI-161: enable hearings flag on prod

[sanjayparekh-hmcts]

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• [ ] commit messages are meaningful and follow good commit message guidelines
• [ ] README and other documentation has been updated / added (if needed)
• [ ] tests have been updated / new tests has been added (if needed)
• [ ] Does this PR introduce a breaking change

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apps/sscs/sscs-hearings-api/prod.yaml

• HEARINGS_CASE_UPDATE_V2_ENABLED setting changed from false to true 🔄.