Prepare release v354

[heroku-linguist]

Commits since the last release:

• Bump the ruby-dependencies group with 7 updates (Bump the ruby-dependencies group with 7 updates #2149)
• Bump the python-dependencies group across 1 directory with 2 updates (Bump the python-dependencies group across 1 directory with 2 updates #2147)
• Re-enable the Poetry Python version mismatch test (Re-enable the Poetry Python version mismatch test #2150)

For the full diff, see the compare view:
v353...main

[heroku-linguist]

Release workflow started: https://github.com/heroku/heroku-buildpack-python/actions/runs/36990372624

[edmorley]

https://devcenter.heroku.com/changelog-items/3825