version update in beta_java18 stream by 0.0.50

Change-Id: I8aed10a14630d9f96e0cbd6283440a52589fb789
Signed-off-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.build/+/192020
2 files changed