removing deps that are no longer needed (bp #781)

[mergify]

This is an automatic backport of pull request #781 done by Mergify.

Cherry-pick of 98f228d has failed:

On branch mergify/bp/release/v4.1.x/pr-781
Your branch is up to date with 'origin/release/v4.1.x'.

You are currently cherry-picking commit 98f228d.
  (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)

Changes to be committed:
	modified:   app/migrate.go
	deleted:    app/prop29.go
	deleted:    app/prop29_test.go
	modified:   go.mod

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.sum

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 (release/v4.1.x@ca15d27). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff                @@
##             release/v4.1.x    #782   +/-   ##
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  Coverage                  ?   0.41%           
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  Files                     ?       7           
  Lines                     ?     483           
  Branches                  ?       0           
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  Hits                      ?       2           
  Misses                    ?     480           
  Partials                  ?       1