Update prob_target.target to current repository URLs and unit versions

I'm editing this by hand and have no idea if I'm doing this right.
Feel free to fix this if you're actually using Eclipse.

de.prob.core/prob_target.target

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde version="3.8"?>
-<target name="prob_target" sequenceNumber="45">
+<target name="prob_target" sequenceNumber="46">
 <locations>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
-<unit id="org.eclipse.gef.sdk.feature.group" version="3.9.101.201408150207"/>
-<repository location="https://download.eclipse.org/releases/luna"/>
+<unit id="org.eclipse.gef.sdk.feature.group" version="3.11.0.201606061308"/>
+<repository location="https://download.eclipse.org/releases/2022-03/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
-<unit id="org.eventb.ide.feature.group" version="3.3.0.201704022034-f9fbb0d"/>
-<unit id="org.rodinp.feature.group" version="1.8.0.201704022034-f9fbb0d"/>
-<repository location="https://stups.hhu-hosting.de/buildlibs/org.rodinp.dev"/>
+<unit id="org.eventb.ide.feature.group" version="3.8.0.202304051545-af2f57e1e"/>
+<unit id="org.rodinp.feature.group" version="1.9.0.202304051545-af2f57e1e"/>
+<repository location="https://rodin-b-sharp.sourceforge.net/core-updates/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
-<unit id="org.eventb.theory.feature.feature.group" version="4.0.0.RC1"/>
+<unit id="org.eventb.theory.feature.feature.group" version="4.0.4.202204011240-f60c57a0"/>
 <repository location="https://rodin-b-sharp.sourceforge.net/updates/"/>
 </location>
 </locations>