[Snyk] Security upgrade org.exist-db:exist-core from 6.2.0 to 6.3.0

[lcahlander]

Snyk has created this PR to fix 2 vulnerabilities in the maven dependencies of this project.

Snyk changed the following file(s):

• backend/xar/pom.xml

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score	Upgrade
	Allocation of Resources Without Limits or Throttling SNYK-JAVA-ORGBOUNCYCASTLE-11777856	601	org.exist-db:exist-core: 6.2.0 -> 6.3.0 No Known Exploit
	Allocation of Resources Without Limits or Throttling SNYK-JAVA-ORGBOUNCYCASTLE-11789705	601	org.exist-db:exist-core: 6.2.0 -> 6.3.0 No Known Exploit

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