[Snyk] Security upgrade org.ff4j:ff4j-web from 1.8.6 to 2.1

[clun]

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 `maven` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • spring-boot-2x/ff4j-sample-security-shiro/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	811/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 9.8	Sandbox Bypass SNYK-JAVA-ORGTHYMELEAF-5811866	org.ff4j:ff4j-web: 1.8.6 -> 2.1	Yes	Proof of Concept

(*) 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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