style: fix ruff format on postgres insert grammar test

[bedus-creation]

Summary

main is currently failing CI on uv run ruff format --check . because of tests/masoniteorm/postgres/grammar/test_postgres_insert_grammar.py (introduced in 7168863, PR #130). This applies ruff format to that single file.

No logic change — formatting only.

Verification

uv run ruff format --check .
510 files already formatted

This unblocks CI on main and on dependent open PRs (e.g. #131).

[bedus-creation]

✅ Code review: APPROVED — formatting-only hotfix verified (formal GitHub approval blocked by shared author identity).

1. ✅ Diff touches ONLY tests/masoniteorm/postgres/grammar/test_postgres_insert_grammar.py (1 file, +1/-2).
2. ✅ No logic/import/behaviour change — the two-line implicitly-concatenated string literal is collapsed into one equivalent single-line literal; the resulting SQL string value is byte-identical (INSERT INTO "users" ("name", "email") VALUES ('Joe', 'joe@example.com'), ('Bob', 'bob@example.com')).
3. ✅ uv run ruff format --check . → 510 files already formatted, 0 violations.

Bonus: the 3 grammar tests in the file still pass. Clears the CI block on main — ready to merge.

[bedus-creation]

Superseded — folded the formatting fix directly into #131 (now updated to latest main), so #131 is self-sufficient and green. Closing this to avoid a duplicate PR.