chore(Java-Release): update release commands and use SNAPSHOT builds (#995)

Author: josecorella

codebuild/release/release.yml

@@ -63,7 +63,7 @@ batch:
   ## available. For more information, consult the MCM used for this release.
   - identifier: validate_release_corretto8
     depend-on:
-        - upload_to_sonatype
+      - upload_to_sonatype
     buildspec: codebuild/release/validate-release.yml
     env:
       variables:

codebuild/release/validate-release.yml

@@ -61,4 +61,3 @@ phases:
       # Run Migration Examples
       - gradle -p runtimes/java/Migration/PlaintextToAWSDBE test
       - gradle -p runtimes/java/Migration/DDBECToAWSDBE test 
-      

codebuild/staging/release-staging.yml

@@ -59,4 +59,4 @@ phases:
       - gradle -p runtimes/java clean
       - gradle -p runtimes/java test
       # Deploy to CA
-      - make mvn_staging_deploy
+      - gradle -p runtimes/java publishMavenPublicationToStagingCodeArtifactRepository

project.properties

@@ -1,4 +1,4 @@
-projectJavaVersion=3.4.0
+projectJavaVersion=3.4.0-SNAPSHOT
 mplDependencyJavaVersion=1.3.0
 dafnyRuntimeJavaVersion=4.2.0
 smithyDafnyJavaConversionVersion=0.1