Upgrade plexus-compiler-eclipse and ecj (#4664)

* Upgrade plexus-compiler-eclipse from 2.12.1 to 2.15.0
  https://github.com/codehaus-plexus/plexus-compiler/releases
* Require maven 3.9.6, this is enforced as required by plexus-compiler
* Upgrade ecj from 3.39.0 to 3.41.0
* Minor adaption of ThingManagerImpl to allow for ecj > 3.39

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.core.thing/src/main/java/org/openhab/core/thing/internal/ThingManagerImpl.java

@@ -245,7 +245,7 @@ public class ThingManagerImpl implements ReadyTracker, ThingManager, ThingTracke
                     "Provider for thing {0} cannot be determined because it is not known to the registry",
                     thing.getUID().getAsString()));
         }
-        if (provider instanceof ManagedProvider<Thing, ThingUID> managedProvider) {
+        if (provider instanceof ManagedProvider managedProvider) {
             managedProvider.update(thing);
         } else {
             logger.debug("Only updating thing {} in the registry because provider {} is not managed.",

pom.xml

@@ -292,12 +292,12 @@ Import-Package: \\
             <dependency>
               <groupId>org.codehaus.plexus</groupId>
               <artifactId>plexus-compiler-eclipse</artifactId>
-              <version>2.12.1</version>
+              <version>2.15.0</version>
             </dependency>
             <dependency>
               <groupId>org.eclipse.jdt</groupId>
               <artifactId>ecj</artifactId>
-              <version>3.39.0</version>
+              <version>3.41.0</version>
             </dependency>
           </dependencies>
         </plugin>
@@ -632,7 +632,7 @@ Import-Package: \\
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>3.6.3</version>
+                  <version>3.9.6</version>
                 </requireMavenVersion>
                 <requireJavaVersion>
                   <version>[21.0,22.0)</version>