deps: pin serde to 1.0.188

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Issue

If applicable, what issue does this address?

Closes: #1285

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3e00e65) 31.64% compared to head (69c9858) 31.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1286   +/-   ##
=======================================
  Coverage   31.64%   31.64%           
=======================================
  Files          98       98           
  Lines       16644    16644           
=======================================
  Hits         5267     5267           
  Misses      11377    11377           

Flag	Coverage Δ
macos-12	33.37% <ø> (ø)
ubuntu-latest	33.20% <ø> (ø)
windows-2019	33.62% <ø> (ø)

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