main.star: temporarily use a devel-channel golangbuild for linux-arm

This is to check if there are other 32-bit issues that will be
revealed only after the fix in crrev.com/c/5268803 is applied.

Change-Id: I73611decaa7a7b092f9d7407442408708f61d422
Reviewed-on: https://go-review.googlesource.com/c/build/+/561335
Auto-Submit: Dmitri Shuralyov <[email protected]>
TryBot-Bypass: Dmitri Shuralyov <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: dmitshur