Upgrade critter project to Spring 3.3 and Java 21

Author: manjunathmr6

starter/critter/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.2.2.RELEASE</version>
+		<version>3.3.5</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.udacity.jdnd.course3</groupId>
@@ -15,7 +15,7 @@
 	<description>Starter code for Critter Chronologer project</description>
 
 	<properties>
-		<java.version>1.8</java.version>
+		<java.version>21</java.version>
 	</properties>
 
 	<dependencies>
@@ -35,8 +35,13 @@
 		</dependency>
 
 		<dependency>
-			<groupId>mysql</groupId>
-			<artifactId>mysql-connector-java</artifactId>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
 			<scope>runtime</scope>
 		</dependency>
 

starter/critter/src/main/resources/application.properties

@@ -2,7 +2,7 @@
 server.port=8082
 
 # Data Source Setup
-# Note: Users must create a mysql db that they will reference here, create a user that has access to it on localhost
+# Note: Users must create a H2 db that they will reference here, create a user that has access to it on localhost
 #       and provide the credentials below to access it
 
 # uncomment the below lines to view sql output in console