light: handle too high errors correctly (backport #6346)

[mergify]

This is an automatic backport of pull request #6346 done by Mergify.

Cherry-pick of d4d2b66 has failed:

On branch mergify/bp/v0.34.x/pr-6346
Your branch is up to date with 'origin/v0.34.x'.

You are currently cherry-picking commit d4d2b6606.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG_PENDING.md
	both modified:   light/client.go

no changes added to commit (use "git add" and/or "git commit -a")

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v0.34.x@a9ac635). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             v0.34.x    #6351   +/-   ##
==========================================
  Coverage           ?   60.41%           
==========================================
  Files              ?      265           
  Lines              ?    24298           
  Branches           ?        0           
==========================================
  Hits               ?    14680           
  Misses             ?     8085           
  Partials           ?     1533           

[cmwaters]

Good work @cmwaters