Upgrade to Spring Boot 2.4.3

Closes gh-432

README.adoc

@@ -3,7 +3,7 @@
 :boot-version: 2.4.1
 :graalvm-version: 20.3.0
 :graalvm-dev-version: 20.1.0
-:boot-dev-version: 2.4.2
+:boot-dev-version: 2.4.3
 :documentation-url: https://repo.spring.io/{repository}/org/springframework/experimental/spring-graalvm-native-docs/{version}/spring-graalvm-native-docs-{version}.zip!
 
 image:https://ci.spring.io/api/v1/teams/spring-native/pipelines/spring-native/badge["Build Status", link="https://ci.spring.io/teams/spring-native/pipelines/spring-native"] image:https://img.shields.io/badge/{version}-documentation-blue.svg["{version} documentation", link="{documentation-url}/reference/index.html"]

pom.xml

@@ -35,7 +35,7 @@
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-dependencies</artifactId>
-				<version>2.4.3-SNAPSHOT</version>
+				<version>2.4.3</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>

spring-native-parent/pom.xml

@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.4.3-SNAPSHOT</version>
+		<version>2.4.3</version>
 		<relativePath/>
 	</parent>
 	<groupId>org.springframework.experimental</groupId>