Update 03-compute-resources.md

Author: techiescamp

01-kubernetes-the-hard-way-aws/docs/03-compute-resources.md

@@ -110,7 +110,7 @@ IMAGE_ID=$(aws ec2 describe-images --owners 099720109477 \
   --filters \
   'Name=root-device-type,Values=ebs' \
   'Name=architecture,Values=x86_64' \
-  'Name=name,Values=ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server*' \
+  'Name=name,Values=ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server*' \
   | jq -r '.Images|sort_by(.Name)[-1]|.ImageId')
 ```