remove version 19 from oracle CI matrix

Author: bckohan

.github/workflows/test.yml

@@ -324,7 +324,6 @@ jobs:
           - '5.0' # April 2025
         oracle-version:
           - '18'
-          - '19'
           - 'latest'
         exclude:
           - python-version: '3.8'
@@ -333,16 +332,10 @@ jobs:
             django-version: '3.2'
           - django-version: '3.2'
             oracle-version: 'latest'
-          - django-version: '3.2'
-            oracle-version: '19'
           - django-version: '4.2'
             oracle-version: '18'
-          - django-version: '4.2'
-            oracle-version: 'latest'
           - django-version: '5.0'
             oracle-version: '18'
-          - django-version: '5.0'
-            oracle-version: '19'
     services:
       oracle: