feat : upgrade to java 21

Author: rajadilipkolli

.github/workflows/spring-boot-kafka-avro-consumer.yml

@@ -24,9 +24,9 @@ jobs:
       with:
           fetch-depth: 0
     - name: Set up JDK
-      uses: actions/setup-java@v4.3.0
+      uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'microsoft'
         cache: 'maven'
     - name: Build with Maven

.gitpod.yml

@@ -15,7 +15,7 @@ ports:
     onOpen: open-browser
   - port: 5050
     visibility: public
-  - port: 9091-9093
+  - port: 9091
     visibility: public
   - port: 8081
     visibility: public

kafka-avro/spring-boot-kafka-avro-consumer/pom.xml

@@ -16,7 +16,7 @@
     <description>Demo project for Spring Boot</description>
 
     <properties>
-        <java.version>17</java.version>
+        <java.version>21</java.version>
         <avro.version>1.12.0</avro.version>
         <confluent.version>7.7.0</confluent.version>
         <springdoc-openapi.version>2.6.0</springdoc-openapi.version>