Set sslmode to prefer for SSH connections

[SteveDMurphy]

Closes #3680

Description Of Changes

• default connection arguments for Redshift via SSH to only prefer SSL

Code Changes

• Specify sslmode=prefer for SSH connections by default

Steps to Confirm

• Tested in with a customer implementation, thinking about alternatvies for testing still

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
• For API changes, the Postman collection has been updated

[cypress]

Passing run #2919 ↗︎

0	4	0	0	0
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Details:

Merge e22ef7c into 243f6e2...
Project: fides	Commit: 207cce9a5a ℹ️
Status: Passed	Duration: 00:44 💡
Started: Jun 27, 2023 11:42 AM	Ended: Jun 27, 2023 11:43 AM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (243f6e2) 87.10% compared to head (e22ef7c) 87.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3685      +/-   ##
==========================================
- Coverage   87.10%   87.09%   -0.01%     
==========================================
  Files         310      310              
  Lines       19031    19033       +2     
  Branches     2437     2437              
==========================================
  Hits        16577    16577              
- Misses       2026     2028       +2     
  Partials      428      428              

Impacted Files	Coverage Δ
src/fides/api/service/connectors/sql_connector.py	65.56% <0.00%> (-0.49%)	⬇️

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[pattisdr]

The issue and the solution make sense to me!

[adamsachs]

looks good! changes are well-scoped to specifically apply only to RedshiftConnector and if CONFIG.security.bastion_server_ssh_private_key is set, so minimal impact for other use cases 👍