[Snyk] Security upgrade notifications-node-client from 4.8.0 to 4.9.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	619/1000 Why? Has a fix available, CVSS 8.1	Prototype Pollution SNYK-JS-AJV-584908	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: notifications-node-client

The new version differs by 7 commits.

• cff5295 Merge pull request Add download URL for 128 reference form #124 from alphagov/document-letter-contact-block
• 4097ad6 Add letter_contact_block to the template responses
• 729dcf3 Merge pull request Move uploaded references to Google Drive #123 from alphagov/snyk-fix-dbbb05e241bcae1433740ec85d4c1fb1
• 66f1665 fix: package.json to reduce vulnerabilities
• bb8b750 Merge pull request Add browser compatibility notice to reference upload page #121 from alphagov/update-temporary-failure-description
• 9b21838 Update content
• 5e0ff1d Update temporary failure description

See the full diff

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