JAVA-3295: Remove redundant java.version property

spring-boot-modules/spring-boot-parent/spring-boot-with-custom-parent/pom.xml

@@ -23,8 +23,4 @@
         </dependency>
     </dependencies>
 
-    <properties>
-        <java.version>1.8</java.version>
-    </properties>
-
 </project>

spring-boot-modules/spring-boot-parent/spring-boot-with-starter-parent/pom.xml

@@ -39,7 +39,6 @@
     </dependencies>
 
     <properties>
-        <java.version>1.8</java.version>
         <spring-boot-starter-data-jpa.version>2.2.5.RELEASE</spring-boot-starter-data-jpa.version>
     </properties>
 </project>

spring-boot-modules/spring-boot-properties-3/pom.xml

@@ -14,9 +14,6 @@
     <name>spring-boot-properties-3</name>
     <description>Spring Boot Properties Module</description>
 
-    <properties>
-        <java.version>1.8</java.version>
-    </properties>
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>

spring-boot-modules/spring-boot-properties/pom.xml

@@ -134,7 +134,6 @@
     </repositories>
 
     <properties>
-        <java.version>1.8</java.version>
         <spring-cloud.version>2020.0.0-M5</spring-cloud.version>
         <commons-configuration.version>1.10</commons-configuration.version>
         <guava.version>20.0</guava.version>

spring-boot-modules/spring-boot-springdoc/pom.xml

@@ -169,7 +169,6 @@
     </build>
 
     <properties>
-        <java.version>1.8</java.version>
         <hibernate.version>5.2.10.Final</hibernate.version>
         <springdoc.version>1.5.2</springdoc.version>
         <asciidoctor-plugin.version>1.5.6</asciidoctor-plugin.version>