chore: enable RUF ruleset for ruff (#2677)

# Description
This PR proposes to enable the
[`RUF`](https://docs.astral.sh/ruff/rules/#ruff-specific-rules-ruf)
ruleset.

```
ruff check .
```

returned:

```
warning: The top-level linter settings are deprecated in favour of their counterparts in the `lint` section. Please update the following options in `pyproject.toml`:
  - 'ignore' -> 'lint.ignore'
  - 'select' -> 'lint.select'
  - 'isort' -> 'lint.isort'
deltalake/table.py:52:26: RUF100 [*] Unused `noqa` directive (unused: `F811`)
deltalake/writer.py:63:26: RUF100 [*] Unused `noqa` directive (unused: `F811`)
tests/pyspark_integration/test_write_to_pyspark.py:109:37: RUF010 [*] Use explicit conversion flag
Found 3 errors.
[*] 3 fixable with the `--fix` option.
```

So these were simply fixed with `ruff check . --fix`.
#2673 handles the fixing of the
outdated config.

---------

Co-authored-by: R. Tyler Croy <rtyler@brokenco.de>

python/deltalake/table.py

@@ -49,7 +49,7 @@
 from deltalake.schema import Schema as DeltaSchema
 
 try:
-    import pandas as pd  # noqa: F811
+    import pandas as pd
 except ModuleNotFoundError:
     _has_pandas = False
 else:

python/deltalake/writer.py

@@ -61,7 +61,7 @@
 )
 
 try:
-    import pandas as pd  # noqa: F811
+    import pandas as pd
 except ModuleNotFoundError:
     _has_pandas = False
 else:

python/pyproject.toml

@@ -83,7 +83,9 @@ select = [
     # pyflakes
     "F",
     # isort
-    "I"
+    "I",
+    # ruff-specific rules
+    "RUF"
 ]
 ignore = ["E501"]
 

python/tests/pyspark_integration/test_write_to_pyspark.py

@@ -106,7 +106,7 @@ def test_checks_min_writer_version(tmp_path: pathlib.Path):
     )
 
     # Add a constraint upgrades the minWriterProtocol
-    spark.sql(f"ALTER TABLE delta.`{str(tmp_path)}` ADD CONSTRAINT x CHECK (c1 > 2)")
+    spark.sql(f"ALTER TABLE delta.`{tmp_path!s}` ADD CONSTRAINT x CHECK (c1 > 2)")
 
     with pytest.raises(
         DeltaProtocolError, match="This table's min_writer_version is 3, but"