fix: change sslmode to require for Postgres

[hughhhh]

SUMMARY

Postgres should use sslmode=require for encryption

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[betodealmeida]

Thanks, @hughhhh !

[codecov]

Codecov Report

Merging #15642 (ddee3f3) into master (34542db) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

❗ Current head ddee3f3 differs from pull request most recent head ddf9c0b. Consider uploading reports for the commit ddf9c0b to get more accurate results

@@            Coverage Diff             @@
##           master   #15642      +/-   ##
==========================================
- Coverage   76.99%   76.76%   -0.23%     
==========================================
  Files         978      978              
  Lines       51486    51486              
  Branches     6950     6950              
==========================================
- Hits        39642    39524     -118     
- Misses      11620    11738     +118     
  Partials      224      224              

Flag	Coverage Δ
hive	?
mysql	81.56% <100.00%> (ø)
postgres	81.58% <100.00%> (ø)
presto	?
python	81.67% <100.00%> (-0.45%)	⬇️
sqlite	81.19% <100.00%> (ø)

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

Impacted Files	Coverage Δ
superset/db_engine_specs/postgres.py	97.02% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.44% <0.00%> (-17.07%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.26% <0.00%> (-1.65%)	⬇️
superset/db_engine_specs/base.py	88.16% <0.00%> (-0.40%)	⬇️
superset/models/core.py	89.79% <0.00%> (-0.27%)	⬇️
superset/utils/core.py	88.77% <0.00%> (-0.13%)	⬇️

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[rosemarie-chiu]

🏷 2021.27