[release-branch.go1.21] html/template: escape additional tokens in MarshalJSON errors

Escape "</script" and "<!--" in errors returned from MarshalJSON errors
when attempting to marshal types in script blocks. This prevents any
user controlled content from prematurely terminating the script block.

Updates #65697
Fixes #65968

Change-Id: Icf0e26c54ea7d9c1deed0bff11b6506c99ddef1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/564196
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
(cherry picked from commit ccbc725f2d678255df1bd326fa511a492aa3a0aa)
Reviewed-on: https://go-review.googlesource.com/c/go/+/567515
Reviewed-by: Carlos Amedee <carlos@golang.org>
2 files changed
tree: 4964f8a3a9d1f0e47e8aa2276167e14ae40c3c22
  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
  17. VERSION
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