Change default version for CRDB testing to latest #6687

Job	Run time
paths-filter	4s
Unit	5m 22s
Build Binary & Image	4m 43s
Datastore Consistency Tests (crdb)	2m 5s
Datastore Integration Tests (crdb)	5m 13s
Datastore Consistency Tests (mysql)	2m 21s
Datastore Integration Tests (mysql)	2m 1s
Integration Tests	3m 22s
Datastore Consistency Tests (spanner)	2m 40s
Datastore Integration Tests (spanner)	1m 50s
Datastore Integration Tests (postgres, 13.8)	3m 36s
Datastore Integration Tests (postgres, 14)	2m 41s
Steelthread	2m 54s
Datastore Integration Tests (postgres, 15)	3m 32s
WASM Tests	1m 16s
Analyzers Unit Tests	1m 0s
Datastore Integration Tests (postgres, 16)	2m 45s
E2E	2m 51s
Datastore Integration Tests (postgres, 17)	7m 14s
Datastore Integration Tests (pgbouncer, 13.8)	3m 4s
Datastore Consistency Tests (postgres, 13.8)	1m 59s
Datastore Integration Tests (pgbouncer, 14)	3m 5s
Datastore Consistency Tests (postgres, 14)	2m 23s
Generate Protobufs	0s
Datastore Consistency Tests (postgres, 15)	2m 20s
Datastore Integration Tests (pgbouncer, 15)	2m 57s
Datastore Consistency Tests (postgres, 16)	2m 21s
Datastore Consistency Tests (postgres, 17)	2m 8s
Datastore Integration Tests (pgbouncer, 16)	3m 38s
Datastore Integration Tests (pgbouncer, 17)	3m 58s
	1h 25m 23s

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