7d63c39bf4
The label used for stable branch is in the form of
release/[0-9][0-9].[0-9][0-9]
Currently we apply the name of the target branch as the label, fix this
and correctly use the current label.
(cherry picked from commit af8bc8e51b)
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>