Align runtime dependencies with Spring Boot 3.5.7

Provide clear separation of dependency versions:
* runtime (excl. agent extension and sample app)
* test
* Maven plugins

Align runtime dependencies with latest Spring Boot version

Signed-off-by: Karsten Schnitter <k.schnitter@sap.com>

Author: KarstenSchnitter

pom.xml

@@ -106,27 +106,32 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <!-- Runtime dependencies (aligned with Spring Boot 3.5.7) -->
         <jackson-jr.version>2.19.2</jackson-jr.version>
         <slf4j.version>2.0.17</slf4j.version>
         <logback.version>1.5.20</logback.version>
-        <log4j2.version>2.25.2</log4j2.version>
+        <log4j2.version>2.24.3</log4j2.version>
+        <servlet.api.version>6.0.0</servlet.api.version>
+
+        <!-- Test dependencies -->
+        <junit.version>5.12.2</junit.version>
+        <assertj.version>3.27.6</assertj.version>
+        <mockito.version>5.20.0</mockito.version>
+        <jmh.version>1.37</jmh.version>
+        <jetty.version>11.0.26</jetty.version>
+        <httpclient.version>4.5.14</httpclient.version>
+
+        <!-- Plugin dependencies -->
         <buildnumber.plugin.version>3.2.1</buildnumber.plugin.version>
         <compiler.plugin.version>3.14.1</compiler.plugin.version>
         <enforcer.plugin.version>3.6.2</enforcer.plugin.version>
         <source.plugin.version>3.3.1</source.plugin.version>
         <jar.plugin.version>3.4.2</jar.plugin.version>
-        <hamcrest.version>1.3</hamcrest.version>
-        <assertj.version>3.27.6</assertj.version>
-        <junit.version>5.12.2</junit.version>
-        <mockito.version>5.20.0</mockito.version>
-        <jmh.version>1.37</jmh.version>
         <surefire.plugin.version>2.22.2</surefire.plugin.version>
         <exec.plugin.version>3.6.2</exec.plugin.version>
         <javadoc.plugin.version>3.12.0</javadoc.plugin.version>
         <gpg.plugin.version>3.2.8</gpg.plugin.version>
-        <httpclient.version>4.5.14</httpclient.version>
-        <servlet.api.version>6.0.0</servlet.api.version>
-        <jetty.version>11.0.26</jetty.version>
         <sonatype.plugin.version>0.9.0</sonatype.plugin.version>
     </properties>