Difference between Debian 8.7 Debian 8.11

Hi, What is different between Debian 8.7 Debian 8.11? What is the end of life for Debian 8.7?

How to upgrade the linux-image package on Debian 8.7 OS

Hi, As Nessus scan report, they are suggested to upgrade the kernel/linux version with *linux-image-3.16.0-4-amd64_3.**16.56-1* but this version is not available for upgrading on your Debian portal. Can you please help us to upgrade the linux version *3.16.0-4-amd64_3.* *16.56-1* on debian 8.7