Update deprecated GitHub action

[tungbq]

Resolves: #269

Update workflow files to use:

• uses: actions/setup-python@v4
• uses: actions/cache@v3

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[tungbq]

There is no change in the test suites or the code, not sure why some CI checkers are failing with DB error:

Database Error
  connection to server at "dlttests.cwz0jfxu0m7m.eu-central-1.rds.amazonaws.com" (18.196.0.3), port 5432 failed: fe_sendauth: no password supplied
  
Error:   file_log:eventmgr.py:63 06:43:43.[120](https://github.com/dlt-hub/dlt/actions/runs/5030898708/jobs/9023625301?pr=345#step:7:121)150 [error] [MainThread]: Encountered an error:

[rudolfix]

@tungbq thanks for fixing this. the reason is that PRs from fork do not have access to our repo secrets so destination tests will not run. I'll take a look and probably merge your work and test it again. we need to split the duckdb and postgres tests from other destinations so those can work from forks