Revert "Upgrade Go in CIPD to 1.7.5"

Revert "Upgrade Go in CIPD to 1.7.5"

This reverts commit 3fb5299febf37456408c81298bbf2092133cb4f3.

Reason for revert: speculative revert to see if it fixes housekeeping bot

Original change's description:
> Upgrade Go in CIPD to 1.7.5
>
> BUG=skia:
>
> Change-Id: I574c704a4c4bee90b26c1d73d17762ae8b8f55f6
> Reviewed-on: https://skia-review.googlesource.com/9192
> Commit-Queue: Joe Gregorio <jcgregorio@google.com>
> Reviewed-by: Ravi Mistry <rmistry@google.com>
>

TBR=rmistry@google.com,jcgregorio@google.com,borenet@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Change-Id: I8fe46a29d4e24d54e769ccfae210bed5d2c4037c
Reviewed-on: https://skia-review.googlesource.com/9198
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>