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Go programs are easy on memory
Go programs are fairly lightweight. Each program includes a small amount of "extra" code that's included in the executable binary. This extra code is called the Go Runtime. One of the purposes of the Go runtime is to cleanup unused memory at runtime.
In other words, the Go compiler includes a small amount of extra logic in every Go program to make it easier for developers to write code that's memory efficient.
Comparison
As a general rule Java programs use more memory than comparable Go programs because Go doesn't use an entire virtual machine to run its programs, just a small runtime. The Go runtime is small enough that it is included directly in each Go program's compiled machine code.
As another general rule Rust and C++ programs use slightly less memory than Go programs because more control is given to the developer to optimize memory usage of the program. The Go runtime just handles it for us automatically.
Idle memory usage
In the chart above, Dexter Darwich compares the memory usage of three very simple programs written in Java, Go, and Rust. As you can see, Go and Rust use very little memory when compared to Java.