[releng] japicmp: update last release version

The baseline for the 5.13 release is 5.12.0.202106070339-r.

Change-Id: Ic4730ca296117d7a7f6e86228ce2393a748c3c06
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

pom.xml

@@ -151,7 +151,7 @@
     <maven.compiler.target>1.8</maven.compiler.target>
     <bundle-manifest>${project.build.directory}/META-INF/MANIFEST.MF</bundle-manifest>
 
-    <jgit-last-release-version>5.11.0.202103091610-r</jgit-last-release-version>
+    <jgit-last-release-version>5.12.0.202106070339-r</jgit-last-release-version>
     <apache-sshd-version>2.6.0</apache-sshd-version>
     <jsch-version>0.1.55</jsch-version>
     <jzlib-version>1.1.1</jzlib-version>