abd9a34a60
validate-backport job started to fail as only old stable branch naming is accepted. This patch extends the script to allow numbers and dot as well in the branch names (like stable/2023.1). Change-Id: Icbdcd5d124717e195d55d9e42530611ed812fadd (cherry picked from commit fe125da63b6508788654f0dab721f13005c09d25) (cherry picked from commit 09f85a8a922e4ad68271886d2389042d4f4d6896)