Fix/coninv overdue issues - #101

Describe your changes

• Update Keycloak from 22.0.1 to 26.8.2-1 and patch its bundled Guava and MariaDB JDBC libraries

Replaced bundled Guava and MariaDB JDBC libraries with temporary fixed versions that will be removed when the Keycloak vender image includes these dependency versions.

These changes resolve 81 coninv findings. The latest scan reports 43 remaining findings, none currently marked fixable or overdue, with no remediation deadlines calculated by coninv.

Notes:

• Token introspection now requires the client requesting the check to appear in the OAuth access token’s audience. This optional EHR path is currently disabled by use_oauth: false.

Issue ticket number and Jira link

N/A

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