Merge pull request #456 from nitram509/pom-fixes

build: fixes Maven warnings (duplicate entry and missing version)

pom.xml

@@ -112,11 +112,6 @@
             <artifactId>spring-boot-starter-websocket</artifactId>
         </dependency>
 
-        <dependency>
-           <groupId>org.springframework.boot</groupId>
-           <artifactId>spring-boot-starter-actuator</artifactId>
-        </dependency>
-
         <dependency>
            <groupId>io.micrometer</groupId>
            <artifactId>micrometer-registry-prometheus</artifactId>
@@ -251,6 +246,7 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>2.7.0</version>
                 <executions>
                     <execution>
                         <goals>