fix(deps): pin syntaqlite below 0.5.0 for Python 3.10 compatibility

[rusackas]

SUMMARY

Master CI has been intermittently red since #41952 bumped syntaqlite 0.4.2 → 0.6.0.

syntaqlite 0.5.0+ (including 0.6.0) imports StrEnum from the stdlib enum module unconditionally:

# syntaqlite/__init__.py
from enum import IntEnum, StrEnum

enum.StrEnum was only added in Python 3.11, yet the package still declares requires-python>=3.10. Superset supports Python 3.10, and superset/sql_validators/sqlite.py imports syntaqlite on the app-init import path (init_views → databases.api → validate_sql → sql_validators), so any test that builds the app fails at import time on Python 3.10:

File ".../syntaqlite/__init__.py", line 21, in <module>
    from enum import IntEnum, StrEnum
ImportError: cannot import name 'StrEnum' from 'enum'

Why it slipped through PR CI and only broke master: the Python-Unit / Python-Integration matrices run the previous (Python 3.10) leg only on pushes to master — PRs run the current (3.11) leg only. So #41952 merged green, and the break surfaces on the next push to master that touches Python files (the changes filter skips the matrix otherwise, which is why some master commits still show green).

FIX

• Revert the pin to the last 3.10-safe range: <0.5.0 for the sqlite extra, >=0.4.2,<0.5.0 for development, and syntaqlite==0.4.2 in requirements/development.txt. (0.4.2 has no StrEnum import; 0.5.1 already added it.)
• Add a Dependabot ignore entry for syntaqlite so it is not immediately re-bumped past 0.5.0 until Superset drops Python 3.10.
• Add explanatory comments at each pin so the constraint isn't "fixed" blindly later.

TESTING INSTRUCTIONS

On Python 3.10, before this change python -c "import superset.sql_validators.sqlite" raises ImportError: cannot import name 'StrEnum'; after pinning back to syntaqlite==0.4.2 the import succeeds. CI's Python-Unit / Python-Integration previous (3.10) legs go green.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration
• Introduces new feature or API
• Removes existing feature or API

Upstream fix would be for syntaqlite to guard the StrEnum import (as Superset itself does in superset/utils/backports.py) or to raise its requires-python to >=3.11. This PR just unblocks master in the meantime.

🤖 Generated with Claude Code

[bito-code-review]

Code Review Agent Run #2745c6

Actionable Suggestions - 0

Review Details

• Files reviewed - 2 · Commit Range: 15ae40c..15ae40c

  • pyproject.toml
  • requirements/development.txt
• Files skipped - 1

  • .github/dependabot.yml - Reason: Filter setting
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.06%. Comparing base (256cc71) to head (ba68b34).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #42007      +/-   ##
==========================================
+ Coverage   64.42%   65.06%   +0.63%     
==========================================
  Files        2747     2747              
  Lines      153801   153801              
  Branches    35266    35266              
==========================================
+ Hits        99086   100067     +981     
+ Misses      52804    51824     -980     
+ Partials     1911     1910       -1     

Flag	Coverage Δ
hive	39.04% <ø> (ø)
mysql	57.88% <ø> (ø)
postgres	57.94% <ø> (?)
presto	41.03% <ø> (ø)
python	59.32% <ø> (+1.29%)	⬆️
sqlite	57.55% <ø> (ø)
unit	100.00% <ø> (?)

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