Revert "bump curve25519-dalek from 3.2.1 to 4.1.3 (#1693)" #7109

Job	Run time
cargo-test-sbf (token/program)	8m 27s
check	3m 33s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 44s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 38s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 20s
cargo-test-sbf (token-upgrade/program)	9m 33s
test (single-pool/cli, single-pool/program)	17m 28s
cargo-test-sbf (feature-proposal/program)	7m 32s
test (token-upgrade/cli, token-upgrade/program)	17m 9s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 13s
cargo-test-sbf (memo/program)	10m 28s
cargo-test-sbf (name-service/program)	8m 58s
cargo-test-sbf (stake-pool/program)	11m 28s
cargo-test-sbf (single-pool/program)	8m 29s
	2h 37m 0s

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