chore: fix deprecation warnings for SQLALchemy URL

[sebastianliebscher]

SUMMARY

SQLAlchemy URL() is deprecated since SQLAlchemy 1.4 in favor of URL.create()

TESTING INSTRUCTIONS

pytest or ./scripts/tests/run.sh

[codecov]

Codecov Report

Merging #23770 (4678d7d) into master (e3719a1) will increase coverage by 0.08%.
The diff coverage is 0.00%.

❗ Current head 4678d7d differs from pull request most recent head c241adc. Consider uploading reports for the commit c241adc to get more accurate results

@@            Coverage Diff             @@
##           master   #23770      +/-   ##
==========================================
+ Coverage   68.13%   68.22%   +0.08%     
==========================================
  Files        1941     1941              
  Lines       75304    75304              
  Branches     8166     8166              
==========================================
+ Hits        51308    51373      +65     
+ Misses      21907    21842      -65     
  Partials     2089     2089              

Flag	Coverage Δ
hive	53.18% <0.00%> (?)
mysql	78.91% <0.00%> (ø)
postgres	78.98% <0.00%> (ø)
presto	53.10% <0.00%> (ø)
python	82.75% <0.00%> (+0.17%)	⬆️
sqlite	77.51% <0.00%> (ø)
unit	53.00% <0.00%> (ø)

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

Impacted Files	Coverage Δ
superset/db_engine_specs/base.py	90.82% <ø> (ø)
superset/db_engine_specs/clickhouse.py	54.87% <0.00%> (ø)
superset/db_engine_specs/databricks.py	70.42% <ø> (ø)
superset/db_engine_specs/snowflake.py	67.25% <ø> (ø)

... and 4 files with indirect coverage changes

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