Patch mongodb version for security updates

[loneil]

"MongoBleed" vulnerability affects the version of MongoDB we deploy for VC-Authn.

NIST detail: https://nvd.nist.gov/vuln/detail/CVE-2025-14847

Mongo issue: https://jira.mongodb.org/browse/SERVER-115508

While nothing too sensitive in that DB (and in our case would probably need to do something else to get a client-side connection, or have a broken network security policy?) it's a should-fix.

Current version seems to be v8.0.4. Could upgrade to latest 8.2.3 or if we don't want to do a minor version, just up to 8.0.17

Docker compose version probably not affected (or would matter) as it pulls an 8.0 reference so probably uses latest of that minor version? Should check on that, and if decision is to use 8.2.x for deployments, upgrade docker compose version of mongo as well.

Work to mitigate deployments in Helm Chart repo tracked here: openwallet-foundation/helm-charts#74

[loneil]

Probably keep this issue open until the linked helm chart issue is released. (and upgrade docker compose here if necessary)

[esune]

#964 aligns the docker version of MongoDB with the current version used by the dependent chart from CloudPirates.

openwallet-foundation/helm-charts#90 updates the chart dependency.