Fix cert and key kwargs parsing from URL in sqlachemy's create_connect_args function

[a-narsudinov]

Description

Previous version of code contained an always true condition that may lead to unintended behaviour. This bug was captured by flake8 linter, so it may be a good idea to include it as a part of CI process.

Non-technical explanation

Release notes

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* Fix `cert` and `key` kwargs parsing from URL in sqlachemy's `create_connect_args` function

[cla-bot]

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[a-narsudinov]

HI gyus! I've signed the CLA, but I guess something went wrong. What should I do next?

[hashhar]

@cla-bot check

[cla-bot]

Thank you for your pull request and welcome to the Trino community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. Continue to work with us on the review and improvements in this PR, and submit the signed CLA to cla@trino.io. Photos, scans, or digitally-signed PDF files are all suitable. Processing may take a few days. The CLA needs to be on file before we merge your changes. For more information, see https://github.com/trinodb/cla

[hashhar]

I took the liberty to add a test. Thanks for the fix.

I'll merge once CLA is processed. It gets processed manually every 2 weeks.

[hashhar]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!