BAEL-6179: Add Actuator sample without Spring Boot (#14032)

* BAEL-6179: Add Actuator sample without Spring Boot

* BAEL-6179: Simplify custom health indicator

parent-spring-6/README.md

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+## Parent Spring 5
+
+This is a parent module for all projects using Spring 5

parent-spring-6/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         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>
+    <artifactId>parent-spring-6</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>parent-spring-6</name>
+    <packaging>pom</packaging>
+    <description>Parent for all spring 6 core modules</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework</groupId>
+                <artifactId>spring-framework-bom</artifactId>
+                <version>${spring.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-core</artifactId>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <spring.version>6.0.8</spring.version>
+    </properties>
+
+</project>