Fix complex value updates

[galvana]

Closes #3899

Description Of Changes

Updating the unflatten_dict util to accept flattened dict values.

Code Changes

• Updating unflatten_dict util

Steps to Confirm

• list any manual steps for reviewers to confirm the changes

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Issue Requirements are Met
• Update CHANGELOG.md

[cypress]

Passing run #4448 ↗︎

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Details:

Merge b54ac9e into 7932483...
Project: fides	Commit: 3c4f4a0035 ℹ️
Status: Passed	Duration: 00:55 💡
Started: Oct 2, 2023 8:26 PM	Ended: Oct 2, 2023 8:27 PM

Review all test suite changes for PR #4200 ↗︎

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7932483) 87.67% compared to head (b54ac9e) 87.68%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4200   +/-   ##
=======================================
  Coverage   87.67%   87.68%           
=======================================
  Files         333      333           
  Lines       20743    20748    +5     
  Branches     2690     2691    +1     
=======================================
+ Hits        18187    18192    +5     
  Misses       2093     2093           
  Partials      463      463           

Files	Coverage Δ
.../fides/api/service/connectors/saas_query_config.py	93.12% <ø> (ø)
src/fides/api/util/saas_util.py	88.94% <100.00%> (+0.28%)	⬆️

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[Kelsey-Ethyca]

nice test!