[chore] update Go to 1.21, and update relevant pkgs

[saurabh100ni]

Desired Behaviour

Need to update Go to 1.21 in go.mod and in Dockerfile, and also Makefile

• Minor chore on updating meshkit and meshery-adapter-library

[AryanSharma9917]

Hey @saurabh100ni, can I work on this?

[saurabh100ni]

Sure 🙂, @Ghat0tkach or @sudhanshutech will assign you.