cmd/go: improve 'go get' handling of retracted versions

'go get' will now warn about retracted versions in the build list,
after updating go.mod. The warning instructs users to run
'go get module@latest' to upgrade or downgrade away from the retracted
version.

'go get' now allows users to explicitly request a specific retracted
version.

For #24031

Change-Id: I15fda918dc84258fb35b615dcd33b0f499481bd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/228383
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
13 files changed
tree: 9285dbc5ce1aac60e63057c10a55db039c9b675c
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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