Use Maven 4 as the runtime for m2eclipse

Maven 4 will soon be released and should be able to execute Maven 3
projects as well. We should therefore upgrade m2e to use Maven 4 from
now on.

For users that require Maven 3.9 line we can offer the latest 3.9.11
maven runtime as an additional install option like we already did for
Maven 3.9.6

Author: laeubi

RELEASE_NOTES.md

@@ -1,5 +1,14 @@
 # Eclipse m2e - Release notes
 
+## 2.10.0 (Planned)
+
+* 📅 Release Date: TBD
+
+### Embed and use Maven 4.0.0-rc-4
+
+Updated the embedded Maven from version 3.9.11 to 4.0.0-rc-4, the first Maven 4 release candidate.
+Maven 4 includes the maven-compat module for backward compatibility with Maven 3 builds.
+
 ## 2.9.1
 
 * 📅 Release Date: 02nd September 2025

target-platform/m2e-runtimes.target

@@ -3,8 +3,12 @@
 <target name="m2e-runtimes">
 	<locations>
 		<location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
-			<repository location="https://download.eclipse.org/technology/m2e/releases/2.2.1/"/>
+			<repository location="https://archive.eclipse.org/technology/m2e/releases/2.2.1/"/>
 			<unit id="org.eclipse.m2e.maven.runtime" version="3.8.701.20230209-1606"/>
 		</location>
+		<location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
+			<repository location="https://download.eclipse.org/technology/m2e/releases/2.9.1"/>
+			<unit id="org.eclipse.m2e.maven.runtime" version="3.9.1100.20250811-2018"/>
+		</location>
 	</locations>
 </target>