Merge pull request #5 from yasokada-lc/feature/spring-boot-2.4.x

update spring-boot 2.4.3

pom.xml

@@ -3,22 +3,29 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
-    <parent>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.3.9.RELEASE</version>
-    </parent>
-
     <groupId>com.github.JanLoebel</groupId>
     <artifactId>json-schema-validation-starter</artifactId>
     <version>2.1.0-SNAPSHOT</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>8</java.version>
+        <spring-boot.version>2.4.3</spring-boot.version>
         <json-schema-validator.version>1.0.49</json-schema-validator.version>
     </properties>
 
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring-boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>