deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v0.20.1 (#381)

removing gson from the flattened-pom exclusion list as it is now back in the original pom list.

Author: stephaniewang526

.kokoro/dependencies.sh

@@ -52,7 +52,7 @@ function completenessCheck() {
  # due to maven dependency plugin setting transitive compile/runtime deps scope to test when it is also a test dep
  # Raised issue: https://issues.apache.org/jira/browse/MDEP-737
  msg "Generating dependency list using flattened pom..."
- mvn dependency:list -f .flattened-pom.xml -DincludeScope=runtime -DexcludeArtifactIds=annotations,gson,protobuf-java-util,commons-codec,commons-logging,perfmark-api -Dsort=true | grep '\[INFO] .*:.*:.*:.*:.*' >.new-list.txt
+ mvn dependency:list -f .flattened-pom.xml -DincludeScope=runtime -DexcludeArtifactIds=annotations,protobuf-java-util,commons-codec,commons-logging,perfmark-api -Dsort=true | grep '\[INFO] .*:.*:.*:.*:.*' >.new-list.txt
 
  # Compare two dependency lists
  msg "Comparing dependency lists..."

pom.xml

@@ -96,7 +96,7 @@
  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-shared-dependencies</artifactId>
- <version>0.20.0</version>
+ <version>0.20.1</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>