[devpryan7792]

Click deprecated CliRunner.isolated_filesystem() with plans to remove it in Click 9.0 (DeprecationWarning: 'isolated_filesystem' is deprecated and will be removed in Click 9.0).

This replaces the 22 with runner.isolated_filesystem(): blocks in tests/test_cli.py and tests/test_insert_files.py with pytest's tmp_path fixture and monkeypatch.chdir(tmp_path).

• All 1,497 tests pass locally with 0 deprecation warnings.
• Code formatted with black and verified with flake8.

Fixes #916

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📚 Documentation preview 📚: https://sqlite-utils--917.org.readthedocs.build/en/917/

[Muguett-DBY]

I checked this on Windows with Python 3.12, Click 8.5 and DeprecationWarning treated as an error. In the two changed test files, the base had 32 failures from isolated_filesystem(); this commit has 218 passing and 4 skipped.

I also compared the 22 changed test functions after accounting for the fixture and context-manager replacement. Their remaining test bodies and assertions match the base. I used Codex for the comparison; this was a focused check of the two files, not a full-suite or non-Windows run.