ci: bump container count for unittests (#31490)

[skip ci]
diff --git a/.github/workflows/server-tests-mariadb.yml b/.github/workflows/server-tests-mariadb.yml
index cdb6849..91a0114 100644
--- a/.github/workflows/server-tests-mariadb.yml
+++ b/.github/workflows/server-tests-mariadb.yml
@@ -39,7 +39,7 @@
       fail-fast: false
 
       matrix:
-        container: [1, 2, 3]
+        container: [1, 2, 3, 4]
 
     name: Python Unit Tests
 
diff --git a/.github/workflows/server-tests-postgres.yml b/.github/workflows/server-tests-postgres.yml
index 77d3c1a..d3268e2 100644
--- a/.github/workflows/server-tests-postgres.yml
+++ b/.github/workflows/server-tests-postgres.yml
@@ -21,7 +21,7 @@
     strategy:
       fail-fast: false
       matrix:
-       container: [1, 2, 3]
+       container: [1]
 
     name: Python Unit Tests