remove usage of libsecp256k1 for secp256k1 in claims pallet #3045

Job	Run time
preflight / preflight	42s
preflight / ci-versions	1m 11s
check-runtime-bridge-hubs	5m 31s
check-runtime-assets	3m 3s
check-runtime-starters	2m 49s
check-runtime-collectives	2m 50s
check-runtime-coretime	2m 46s
check-runtime-contracts	2m 54s
check-runtime-testing	3m 1s
All check-runtime-* tests passed	1s
	24m 48s

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