build: bump curve25519-dalek from 4.1.1 to 4.1.2 in /packages/cacti-plugin-ledger-connector-stellar/src/test/rust/demo-contract in the cargo group across 1 directory

build: bump curve25519-dalek from 4.1.1 to 4.1.2 in /packages/cacti-plugin-ledger-connector-stellar/src/test/rust/demo-contract in the cargo group across 1 directory #642