Please update to golang 1.9

Description

golang 1.9 includes the following fix:

On Windows, Go no longer forces the system timer to run at high resolution when the program is idle. This should reduce the impact of Go programs on battery life.

See https://golang.org/doc/go1.9

This might fix the high idle CPU usage problem on Windows as described in #2947 (closed)

Proposal

Please update to golang 1.9

Links to related issues and merge requests / references

#2947 (closed)

The last golang update to 1.8 was merged in !620 (merged) for reference