chore(deps): upgrade pubsublite dependency to 1.2 (#72)

Author: palmere-google

pom.xml

@@ -5,15 +5,15 @@
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite-parent</artifactId>
-        <version>0.18.0</version>
+        <version>1.2.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>jar</packaging>
     <artifactId>google-cloud-pubsublite-flink</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <properties>
         <flink.version>1.13.2</flink.version>
-        <pubsublite.version>0.18.0</pubsublite.version>
+        <pubsublite.version>1.2.0</pubsublite.version>
     </properties>
     <build>
         <extensions>