Update SQLAlchemy to latest Python 2.7 compatible version

[rtibbles]

Summary

• Ceci n'est pas un dependabot
• I thought this upgrade might help import performance of SQLAlchemy, but it did not - but worth having for bug fixes anway.

References

Changelog: https://github.com/sqlalchemy/sqlalchemy/blob/main/doc/build/changelog/changelog_14.rst

Reviewer guidance

Do Python tests still pass?

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0b1.dev0_git.56.gc73df53e.pex
Windows Installer (EXE)	kolibri-0.16.0b1.dev0+git.56.gc73df53e-unsigned.exe
Debian Package	kolibri_0.16.0b1.dev0+git.56.gc73df53e-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b1.dev0+git.56.gc73df53e-0.3.0.dmg
TAR file	kolibri-0.16.0b1.dev0+git.56.gc73df53e.tar.gz
WHL file	kolibri-0.16.0b1.dev0+git.56.gc73df53e-py2.py3-none-any.whl

[jredrejo]

Checking changelog https://docs.sqlalchemy.org/en/20/changelog/changelog_14.html#change-1.4.49 nothing appears to affect our codebase directly , and in any case, as you mentioned, there are several regressions and bug fixes.
Tested it. So far, so good.