[libgda] CI: switch to ubuntu latest because MySQL

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit fc1061f04577a66641e7adea383e20e4035560f4
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Sep 16 23:23:13 2021 -0500

    CI: switch to ubuntu latest because MySQL
    
    We have tests against MySQL 8 and MariaDb is the only
    avilable on Debian Stable, so switching to LTS version
    of Ubuntu

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4f1b1db28..87b1058b8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@
 # use the official gcc image, based on debian
 # can use verions as well, like gcc:5.2
 # see https://hub.docker.com/_/gcc/
-image: debian:stable
+image: ubuntu:latest
 
 services:
   - postgres:11