Bump github.com/dgraph-io/ristretto from 0.1.1 to 0.2.0 (#3457) #52

Job	Run time
Linting	2m 14s
Build for Linux (linux, amd64)	3m 52s
Build for Linux (linux, 386)	1m 43s
Build for Windows (windows, amd64)	2m 32s
Unit tests	3m 3s
WASM build test	0s
Initial tests passed	4s
Upgrade tests	7m 35s
Sytest (SQLite native)	5m 38s
Sytest (SQLite Cgo)	5m 40s
Sytest (PostgreSQL)	6m 54s
Upgrade tests from HEAD-2	7m 4s
Integration tests	5m 29s
Complement (SQLite native)	4m 2s
Complement (SQLite Cgo)	5m 9s
Complement (PostgreSQL)	9m 28s
Integration tests passed	2s
Update Docker images	0s
	1h 10m 29s

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