Local install before changing version

tests.sh

@@ -252,6 +252,9 @@ build_java_linkage_monitor() {
   # Example: "3.9.0" (without 'rc')
   VERSION=`grep '<version>' pom.xml |head -1 |perl -nle 'print $1 if m/<version>(\d+\.\d+.\d+)/'`
   cd bom
+  # This local installation avoids the problem caused by a new version not yet in Maven Central
+  # https://github.com/protocolbuffers/protobuf/issues/6627
+  mvn install
   $MVN versions:set -DnewVersion=${VERSION}-SNAPSHOT
   cd ..
   $MVN versions:set -DnewVersion=${VERSION}-SNAPSHOT