Add jtapiab as a gitlab-shell reviewer
After chatting with @jtapiab, we thought it was a good idea to update the list of gitlab-shell reviewers which is where Renovate based MRs are assigned from. This will result in Javiera being randomly assigned as a reviewer for Renovate MRs.
WDYT @jtapiab, @andr3, @dpoosarla