fix(deps): update casclientversion to v3.6.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jasig.cas.client:cas-client-support-distributed-ehcache (source)	3.6.2 -> 3.6.4
org.jasig.cas.client:cas-client-core (source)	3.6.2 -> 3.6.4

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