MINOR: Update 3.9 branch version to 3.9.1-SNAPSHOT

Author: cmccabe

gradle.properties

@@ -23,7 +23,7 @@ group=org.apache.kafka
 #  - streams/quickstart/pom.xml
 #  - streams/quickstart/java/src/main/resources/archetype-resources/pom.xml
 #  - streams/quickstart/java/pom.xml
-version=3.9.0
+version=3.9.1-SNAPSHOT
 scalaVersion=2.13.14
 # Adding swaggerVersion in gradle.properties to have a single version in place for swagger
 # New version of Swagger 2.2.14 requires minimum JDK 11.

streams/quickstart/java/pom.xml

@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.kafka</groupId>
         <artifactId>streams-quickstart</artifactId>
-        <version>3.9.0</version>
+        <version>3.9.1-SNAPSHOT</version>
         <relativePath>..</relativePath>
     </parent>
 

streams/quickstart/java/src/main/resources/archetype-resources/pom.xml

@@ -29,7 +29,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <kafka.version>3.9.0</kafka.version>
+        <kafka.version>3.9.1-SNAPSHOT</kafka.version>
         <slf4j.version>1.7.36</slf4j.version>
     </properties>
 

streams/quickstart/pom.xml

@@ -22,7 +22,7 @@
     <groupId>org.apache.kafka</groupId>
     <artifactId>streams-quickstart</artifactId>
     <packaging>pom</packaging>
-    <version>3.9.0</version>
+    <version>3.9.1-SNAPSHOT</version>
 
     <name>Kafka Streams :: Quickstart</name>
 

tests/kafkatest/__init__.py

@@ -22,4 +22,4 @@
 # Instead, in development branches, the version should have a suffix of the form ".devN"
 #
 # For example, when Kafka is at version 1.0.0-SNAPSHOT, this should be something like "1.0.0.dev0"
-__version__ = '3.9.0'
+__version__ = '3.9.1.dev0'