script: ceph-backport.sh adds redmine key to api requests

script: ceph-backport.sh adds redmine key to api requests

the ceph-backport.sh script recently started failing with:

> ceph-backport.sh: DEBUG: Considering Redmine issue: https://tracker.ceph.com/issues/70374 - is it in the Backport tracker?
> ceph-backport.sh: DEBUG:
> ceph-backport.sh: ERROR: Issue https://tracker.ceph.com/issues/70374 is not a Backport

because the command `curl --silent https://tracker.ceph.com/issues/70374.json`
now fails with `HTTP/2 401` (Unauthorized) and returns an empty string

the command succeeds after adding my redmine key as a query param like
some of the other redmine requests

Signed-off-by: Casey Bodley <cbodley@redhat.com>