[CI] Update mariadb version

This commit updates the version of the database for SortingHat.
Now SortingHat requires Mariadb 10.4 or higher and MySQL 8.1 or
higher.

Signed-off-by: Jose Javier Merchante <jjmerchante@bitergia.com>

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     services:
       mysql:
-        image: mysql:5.7
+        image: mariadb:10.5
         env:
           MYSQL_ROOT_PASSWORD: root
         ports:

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     services:
       # How to use MySQL
       mysql:
-        image: mysql:5.7
+        image: mariadb:10.5
         env:
           MYSQL_ROOT_PASSWORD: root
         ports: