[FLINK-35322][Connectors/Google PubSub] Remove weekly tests of 1.19 for unsupporting version v3.0

diff --git a/.github/workflows/weekly.yml b/.github/workflows/weekly.yml
index bd8b333..f0c481e 100644
--- a/.github/workflows/weekly.yml
+++ b/.github/workflows/weekly.yml
@@ -42,10 +42,6 @@
           jdk: '8, 11, 17',
           branch: main
         }, {
-          flink: 1.19.0,
-          jdk: '8, 11, 17, 21',
-          branch: v3.0
-        }, {
           flink: 1.18.1,
           jdk: '8, 11, 17',
           branch: v3.0