chore: Use mariadb 11.5 in CI pipelines

With v11.6.2+, a default was changed
(https://mariadb.com/kb/en/innodb-system-variables/#innodb_snapshot_isolation)
which causes e2e test failures currently

.github/workflows/build_and_test_branches.yml

@@ -63,7 +63,7 @@ jobs:
         runs-on: ubuntu-latest
         services:
             mariadb:
-                image: bitnami/mariadb:11.7
+                image: bitnami/mariadb:11.5
                 env:
                     MARIADB_ROOT_USER: vendure
                     MARIADB_ROOT_PASSWORD: password

.github/workflows/build_and_test_master.yml

@@ -61,7 +61,9 @@ jobs:
         runs-on: ubuntu-latest
         services:
             mariadb:
-                image: bitnami/mariadb:11.7
+                # With v11.6.2+, a default was changed, (https://mariadb.com/kb/en/innodb-system-variables/#innodb_snapshot_isolation)
+                # which causes e2e test failures currently
+                image: bitnami/mariadb:11.5
                 env:
                     MARIADB_ROOT_USER: vendure
                     MARIADB_ROOT_PASSWORD: password

.github/workflows/build_and_test_pr.yml

@@ -63,7 +63,7 @@ jobs:
         runs-on: ubuntu-latest
         services:
             mariadb:
-                image: bitnami/mariadb:11.7
+                image: bitnami/mariadb:11.5
                 env:
                     MARIADB_ROOT_USER: vendure
                     MARIADB_ROOT_PASSWORD: password