remove usage of libsecp256k1 for secp256k1 in claims pallet #9369

Job	Run time
check-fail-ci	13s
check-dependency-rules	8s
check-markdown	18s
check-workspace	27s
preflight / preflight	41s
preflight / ci-versions	1m 4s
fmt	1m 10s
check-rust-feature-propagation	1m 56s
check-toml-format	1m 1s
check-umbrella	2m 9s
test-rust-features	2m 1s
All quick checks passed	1s
	11m 9s

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