Update to vega 0.76.8 (#750) #1725

Job	Run time
Download frontend dependencies	28s
Download backend dependencies (macos-latest, amd64)	36s
Download backend dependencies (macos-latest, arm64)	26s
Download backend dependencies (windows-latest, amd64)	2m 11s
Download backend dependencies (ubuntu-latest, amd64)	24s
Hash frontend	5s
Build frontend (mainnet)	8s
Build frontend (fairground)	8s
Run end-to-end tests (dev)	4m 39s
Build application (mainnet, macos-latest, amd64)	1m 26s
Run end-to-end tests (mainnet)	2m 54s
Build application (fairground, macos-latest, amd64)	1m 53s
Run end-to-end tests (fairground)	2m 52s
Build application (mainnet, macos-latest, arm64)	1m 20s
Build application (fairground, macos-latest, arm64)	1m 39s
Build application (mainnet, windows-latest, amd64)	3m 37s
Build application (fairground, windows-latest, amd64)	3m 13s
Build application (mainnet, ubuntu-latest, amd64)	1m 47s
Build application (fairground, ubuntu-latest, amd64)	1m 51s
	31m 37s

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