Update CI/CD with new system-contract repository name

[ericpassmore]

System contracts will be renamed in github from eosnetworkfoundation/eos-system-contracts to vaultafoundation/system-contracts the CI/CD should be updated to use this new name.

spring/.github/workflows/build.yaml

Lines 334 to 335 in 9abdcb4

	repository: eosnetworkfoundation/eos-system-contracts
	path: eos-system-contracts

Starting with Spring 1.1.2