[Snyk] Security upgrade notifications-node-client from 4.6.0 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
	405/1000 Why? 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 117 commits.

• cff5295 Merge pull request #124 from alphagov/document-letter-contact-block
• 4097ad6 Add letter_contact_block to the template responses
• 729dcf3 Merge pull request #123 from alphagov/snyk-fix-dbbb05e241bcae1433740ec85d4c1fb1
• 66f1665 fix: package.json to reduce vulnerabilities
• bb8b750 Merge pull request #121 from alphagov/update-temporary-failure-description
• 9b21838 Update content
• 5e0ff1d Update temporary failure description
• 8e4f177 Merge pull request #118 from alphagov/iscsv
• 41e6ea3 Update variable name for `prepareUpload` to be more accurate
• f682703 Add isCsv argument to prepareUpload function
• 91aec89 Merge pull request #119 from alphagov/update-status-tables
• 923f7ea Fix links
• badb54c Merge pull request #120 from alphagov/guest-list
• 4fd6e74 Rename whitelist to guest list
• f3e61df Remove status table and add links
• df8fad9 Update the status table for multiple messages
• 54d8297 Update status tables
• 87d1b0f Merge pull request #115 from alphagov/concourse-test-pr-113
• b58ed1f Merge pull request #116 from alphagov/add-repo-to-package-json
• a9efcfb Add repository to package.json
• 678a40d BAU: remove __dirname global call from api client
• 7241423 Merge pull request #112 from alphagov/test-pass-postcode-validation
• d5915d4 Add new error to the docs
• c464fcd Update documentation

See the full diff

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