ci: stale apt cache (#31217)

diff --git a/.github/helper/install.sh b/.github/helper/install.sh
index 69749c9..f0f83b0 100644
--- a/.github/helper/install.sh
+++ b/.github/helper/install.sh
@@ -11,7 +11,7 @@
 
 cd ~ || exit
 
-sudo apt-get install redis-server libcups2-dev
+sudo apt update && sudo apt install redis-server libcups2-dev
 
 pip install frappe-bench