[Snyk] Security upgrade @actions/core from 1.2.6 to 1.9.1

[DavidPHirsch]

This PR was automatically created by Snyk using the credentials of a real user.

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:
  • tools/slack-release-notifier/package.json
  • tools/slack-release-notifier/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	536/1000 Why? Recently disclosed, Has a fix available, CVSS 5	Improper Input Validation SNYK-JS-ACTIONSCORE-2980270	No	No Known Exploit

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

Check the changes in this PR to ensure they won't cause issues with your project.

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