[FLINK-39443][release] create dev-2.4

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 124f9b2..8e24015 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@
 on: [push, pull_request]
 
 env:
-  FLINK_TAR_URL: "https://s3.amazonaws.com/flink-nightly/flink-2.3-SNAPSHOT-bin-scala_2.12.tgz"
+  FLINK_TAR_URL: "https://s3.amazonaws.com/flink-nightly/flink-2.4-SNAPSHOT-bin-scala_2.12.tgz"
 
 jobs:
   ci: