cmd/go: go env GOMOD should not download newer toolchain

It is not neccessary to download a newer toolchain to display the path
to GOMOD or GOWORK.

Fixes: #61455

Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-windows-amd64-longtest
Change-Id: I0b031651ad9bfeb5565361ecaff6908640ccf9c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/581275
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
2 files changed
tree: 57b59802936dac4e974163d8949b75e3087b1894
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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