build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter from 0.40.0 to 0.42.2 in /benchmarks/latency-comparison/java

build(deps): bump com.google.cloud:google-cloud-spanner-pgadapter from 0.40.0 to 0.42.2 in /benchmarks/latency-comparison/java #1873