[Snyk] Fix for 1 vulnerabilities

[LucaFilipozzi]

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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:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	454/1000 Why? Has a fix available, CVSS 4.8	Improper Certificate Validation SNYK-JAVA-ORGKEYCLOAK-5291542	org.keycloak:keycloak-core: 15.0.2 -> 21.1.2 org.keycloak:keycloak-server-spi: 15.0.2 -> 21.1.2 org.keycloak:keycloak-server-spi-private: 15.0.2 -> 21.1.2 org.keycloak:keycloak-services: 15.0.2 -> 21.1.2	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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