NPA-6501: bump spec version before release

[ehallam]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6501

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📄 Description/Summary of Changes

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🧪 Developer Testing Carried Out

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📋 PR Principles

• Keep PRs Small and Focused: Ensure the PR addresses a single task or feature to make it easier to review.
• Multiple PRs for one Ticket: When splitting work into multiple PRs, clearly describe what this PR addresses and outline the remaining work to complete the ticket.
• Ensure Tests Are Included: Add or update unit, integration, or end-to-end tests to cover the changes made.
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🏷️ Naming Conventions Reminder

Please ensure the following naming conventions are followed:

• PR title follows the format: NPA-XXXX: <short-description>
• Branch name follows the convention: <type>/NPA-XXXX/<short-description>
• Commit messages follow the template: NPA-XXXX: <short-description>

[github-actions]

This branch is work on a ticket in the NHS Digital NPA JIRA Project. Here's a handy link to the ticket:

NPA-6501