Add rocksdb to flink dependencies

theodolite-benchmarks/buildSrc/src/main/groovy/theodolite.beam.flink.gradle

@@ -4,4 +4,5 @@ plugins {
 
 dependencies {
     compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
+    compile group: 'org.apache.flink', name: 'flink-statebackend-rocksdb_2.11', version: '1.12.0'
 }
\ No newline at end of file

theodolite-benchmarks/buildSrc/src/main/groovy/theodolite.beam.gradle

@@ -29,7 +29,6 @@ dependencies {
     implementation project(':beam-commons')
 
     implementation group: 'org.apache.beam', name: 'beam-sdks-java-core', version: '2.22.0'
-//    compile group: 'org.apache.beam', name: 'beam-runners-flink-1.12', version: '2.27.0'
 
     implementation('org.apache.beam:beam-sdks-java-io-kafka:2.22.0'){
         exclude group: 'org.apache.kafka', module: 'kafka-clients'