Changes

repo-install-test: ignore sdcc-dbgsym

Fix for this error with debian 13:

  The following packages have unmet dependencies:
   sdcc-dbgsym : Depends: sdcc (= 4.2.0~osmocom3.113.9edd) but 4.5.0+dfsg-1 is to be installed
  E: Unable to correct problems, you have held broken packages.
  E: The following information from --solver 3.0 may provide additional context:
     Unable to satisfy dependencies. Reached two conflicting decisions:
     1. sdcc:amd64=4.2.0~osmocom3.113.9edd is not selected for install
     2. sdcc:amd64=4.2.0~osmocom3.113.9edd is selected for install because:
        1. sdcc-dbgsym:amd64=4.2.0~osmocom3.113.9edd is selected for install
        2. sdcc-dbgsym:amd64 Depends sdcc (= 4.2.0~osmocom3.113.9edd)

Change-Id: Ibb12118853f354d177cb94df63b60dd3bd9dfcb7