Update to use forc `v0.66.6` and fuel core `v0.40.0` #603

Job	Run time
build-examples (examples/src3-mint-burn)	30s
build-examples (examples/src5-ownership)	27s
build-examples (examples/src6-vault)	28s
build-sway-standards	29s
build-examples (examples/src7-metadata)	28s
build-examples (examples/src11-security-information)	28s
build-examples (examples/src12-contract-factory)	27s
build-examples (examples/src14-simple-proxy)	25s
build-examples (examples/src15-offchain-metadata)	29s
build-examples (examples/src20-native-asset)	33s
	4m 44s

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