[Snyk] Security upgrade passport-saml from 2.0.5 to 3.2.1

[snyk-bot]

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • plugins/auth-backend/package.json

⚠️ Warning

``` Failed to update the yarn.lock, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	566/1000 Why? Recently disclosed, Has a fix available, CVSS 5.6	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430337	Yes	No Known Exploit
	651/1000 Why? Recently disclosed, Has a fix available, CVSS 7.3	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430339	Yes	No Known Exploit
	566/1000 Why? Recently disclosed, Has a fix available, CVSS 5.6	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430341	Yes	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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