[Snyk] Security upgrade org.keycloak:keycloak-services from 15.0.2 to 21.1.2

[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
	479/1000 Why? Has a fix available, CVSS 5.3	Creation of Temporary File With Insecure Permissions SNYK-JAVA-ORGJBOSSRESTEASY-3338628	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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