fix: Removes psycopg2 as a required dependency

[michael-s-molina]

SUMMARY

Removes psycopg2 as a required dependency in superset/db_engine_specs/postgres.py

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests should pass

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

[codecov]

Codecov Report

Merging #20543 (290f7c0) into master (4eb2a6f) will decrease coverage by 11.83%.
The diff coverage is 0.00%.

❗ Current head 290f7c0 differs from pull request most recent head a87aa43. Consider uploading reports for the commit a87aa43 to get more accurate results

@@             Coverage Diff             @@
##           master   #20543       +/-   ##
===========================================
- Coverage   66.84%   55.00%   -11.84%     
===========================================
  Files        1752     1752               
  Lines       65447    65447               
  Branches     6912     6912               
===========================================
- Hits        43746    36000     -7746     
- Misses      19952    27698     +7746     
  Partials     1749     1749               

Flag	Coverage Δ
hive	53.77% <0.00%> (-0.01%)	⬇️
mysql	?
postgres	?
presto	53.63% <0.00%> (-0.01%)	⬇️
python	58.40% <0.00%> (-24.51%)	⬇️
sqlite	?
unit	50.66% <0.00%> (-0.01%)	⬇️

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	58.47% <0.00%> (-38.14%)	⬇️
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/upsert.py	0.00% <0.00%> (-89.59%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-89.37%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.88% <0.00%> (-68.24%)	⬇️
superset/datasets/commands/create.py	30.18% <0.00%> (-67.93%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-67.45%)	⬇️
... and 276 more

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[zhaoyongjie]

LGTM, thanks for the fixing. psycopy2-binary is not in the dependency list.