gitlab-CI fails in 3.0 branch due to missing libprotobuf-c >= version 1.1

[strk]

​https://gitlab.com/postgis/postgis/-/jobs/1829960917

[strk]

The tickets.sql test fails with this message:

+ERROR:  ST_AsGeobuf: Missing libprotobuf-c >= version 1.1

I think the test should be MOVED to geobuf.sql instead, which is ONLY enabled when GEOBUF is enabled.

[strk]

In 3.1 branch and above the test was already moved to the appropriate file with [ded6c340501289255ad0aca03bb34ff185de0bd8/git]

[Sandro Santilli <strk@…>]

In 4e1e532f/git:

Move geobuf tests from tickets to geobuf

… So doesn't fail on systems that don't have mvt/geobuf installed

Fixes #5031

[strk]

I've pushed a backport of that commit to the stable-3.0 branch