Increase Default Pool Size and Max Overflow

[pattisdr]

Closes Issue: N/A

Code Changes

• Updates default values for task and api engine pool size and max overflow values

Steps to Confirm

• list any manual steps for reviewers to confirm the changes

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

Quick follow-up to #2511. Bump pool_size and max_overflow to 50 each as defaults to start.

[codecov]

Codecov Report

Base: 88.66% // Head: 88.66% // No change to project coverage 👍

Coverage data is based on head (faf99b1) compared to base (6ee0c2a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2560   +/-   ##
=======================================
  Coverage   88.66%   88.66%           
=======================================
  Files         331      331           
  Lines       16099    16099           
  Branches     4469     4469           
=======================================
  Hits        14274    14274           
  Misses       1668     1668           
  Partials      157      157           

Impacted Files	Coverage Δ
src/fides/lib/db/session.py	89.65% <ø> (ø)
src/fides/core/config/database_settings.py	92.00% <100.00%> (ø)

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