sqlite3: disallow using a sequence of params with named placeholders

[erlend-aasland]

Feature or enhancement

Follow-up of...:

• #101693:

Based on the discussion in the above linked Discourse topic, I propose to now issue a deprecation warning if sequences are used with named placeholders. The deprecation warning should inform that from Python 3.14 and onward, sqlite3.ProgrammingError will be raised instead.

3.14 dev is now opened, so let's convert the deprecation warning to a programming error sooner than later.

Linked PRs

• gh-118929