chore: support python 3.14

[branchv]

Fixes #852

Needs tconbeer/textual-fastdatatable#146

Does this PR require a change to Harlequin's docs?

• No.
• Yes, and I have opened a PR at tconbeer/harlequin-web.
• Yes; I haven't opened a PR, but the gist of the change is: ...

Did you add or update tests for this change?

• Yes.
• No, I believe tests aren't necessary.
• No, I need help with testing this change.

Please complete the following checklist:

• I have added an entry to CHANGELOG.md, under the [Unreleased] section heading. That entry references the issue closed by this PR.
• I acknowledge Harlequin's MIT license. I do not own my contribution.

[tconbeer]

shipped textual-fastdatatable==0.14.0 just now

[branchv]

Looks like duckdb does not yet have a stable release with 3.14 wheels, but there are some preleases so I've allowed those on 3.14

And databricks-sql-connecter pins to pandas<2.3 but only pandas==2.3.3 started shipping 3.14 wheels: databricks/databricks-sql-python#586. Not ideal but at least 3.14 users aren't blocked

---

Just noticed due to python upper bounds, non-uv users will also need:

• feat: add support for python 3.14 harlequin-mysql#36
• feat: add support for python 3.14 harlequin-odbc#22
• feat: add support for python 3.14 harlequin-postgres#48

[tconbeer]

see #880

[branchv]

thanks for your help @tconbeer!