cmd/go: switch toolchain if necessary in applyUpgrades

In applyUpgrades, in the go get upgrade loop, switch to a newer version
of the toolchain if we encounter a dependency we want to add that
requires a newer go version.

This fixes the case where go get -u work adds a dependency that bumps up
the minimum required go version of the work module.

Fixes #79917

Change-Id: Ia01a692cf2f17de15a9ac3e3ebf9704c6a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/794800
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
4 files changed
tree: c67c1b9d232b7d578b0d30d3e42dec7afb4e8370
  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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