Drop Spring Boot 1.x support (#419)

Author: deki

aws-serverless-java-container-spring/pom.xml

@@ -17,7 +17,6 @@
 
     <properties>
         <spring.version>5.2.16.RELEASE</spring.version>
-        <springboot.version>1.5.22.RELEASE</springboot.version>
         <spring-security.version>5.2.11.RELEASE</spring-security.version>
     </properties>
 
@@ -89,38 +88,6 @@
             <version>2.2.4</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot</artifactId>
-            <version>${springboot.version}</version>
-            <optional>true</optional>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.springframework</groupId>
-                    <artifactId>spring-context</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.springframework</groupId>
-                    <artifactId>spring-core</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-autoconfigure</artifactId>
-            <version>${springboot.version}</version>
-            <scope>test</scope>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.springframework</groupId>
-                    <artifactId>spring-context</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.springframework</groupId>
-                    <artifactId>spring-core</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
         <dependency>
             <groupId>org.springframework.security</groupId>
             <artifactId>spring-security-config</artifactId>