Update stable19 target versions

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

.drone.yml

@@ -5,7 +5,7 @@ steps:
     image: nextcloudci/php7.2:php7.2-9
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: sqlite
     commands:
       - composer install
@@ -28,7 +28,7 @@ steps:
     image: nextcloudci/php7.2:php7.2-13
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: sqlite
     commands:
       - bash ./tests/drone-server-setup.sh $APP_NAME $CORE_BRANCH $DB
@@ -39,7 +39,7 @@ steps:
     image: nextcloudci/php7.3:php7.3-5
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: sqlite
     commands:
       - bash ./tests/drone-server-setup.sh $APP_NAME $CORE_BRANCH $DB
@@ -50,7 +50,7 @@ steps:
     image: nextcloudci/php7.4:2
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: sqlite
     commands:
       - bash ./tests/drone-server-setup.sh $APP_NAME $CORE_BRANCH $DB
@@ -72,7 +72,7 @@ steps:
     image: nextcloudci/php7.2:php7.2-13
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: mysql
     commands:
       - bash ./tests/drone-server-setup.sh $APP_NAME $CORE_BRANCH $DB
@@ -103,7 +103,7 @@ steps:
     image: nextcloudci/php7.2:php7.2-13
     environment:
       APP_NAME: text
-      CORE_BRANCH: master
+      CORE_BRANCH: stable19
       DB: postgres
     commands:
       - bash ./tests/drone-server-setup.sh $APP_NAME $CORE_BRANCH $DB