Problem: update voting_period is not tested

[mmsqe]

👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d71c53c) 33.05% compared to head (4f6f35a) 25.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1017      +/-   ##
==========================================
- Coverage   33.05%   25.06%   -7.99%     
==========================================
  Files         126      125       -1     
  Lines       20014    20012       -2     
==========================================
- Hits         6616     5017    -1599     
- Misses      12339    14177    +1838     
+ Partials     1059      818     -241     

Flag	Coverage Δ
integration_tests	?
integration_tests_byzantine	?
integration_tests_gov	?
integration_tests_grpc	?
integration_tests_ibc	24.75% <ø> (-0.02%)	⬇️
integration_tests_ledger	?
integration_tests_slow	?
integration_tests_solomachine	?
integration_tests_upgrade	9.95% <ø> (ø)
unit_tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

see 37 files with indirect coverage changes

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