[Maintenance] Security configuration adoption from DigiWF

[devtobi]

Relevant component

refarch-gateway

Problem description (optional)

No response

Desired solution

DigiWF uses Spring 3 and has a dedicated Maven dependency for security configuration.
We should investigate what configuration we can adopt for the gateway.

Note: This issue is not about externalizing security configuration into a dedicated package. This could be done in a later step.

Considered alternatives (optional)

No response

Additional context (optional)

No response

No duplicate

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