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api: use SHA-256 for rule group pagination tokens

api: use SHA-256 for rule group pagination tokens: a task in rh-swe-bench (Harbor dataset). Title: Enhancement: Replace SHA-1 with SHA-256 for Rule Group pagination tokens

The task

**Title:** Enhancement: Replace SHA-1 with SHA-256 for Rule Group pagination tokens

Part of rounakbende/rh-swe-bench.