chore: Format Python code to make its linter happy (#3631)

https://github.com/apache/avro/actions/runs/21238630219/job/61111610761
```
lint: commands[1]> black --check .
would reformat /home/runner/work/avro/avro/lang/py/avro/constants.py
would reformat /home/runner/work/avro/avro/lang/py/avro/__main__.py
would reformat /home/runner/work/avro/avro/lang/py/avro/datafile.py
would reformat /home/runner/work/avro/avro/lang/py/avro/name.py
would reformat /home/runner/work/avro/avro/lang/py/avro/test/test_schema.py

Oh no! 💥 💔 💥
5 files would be reformatted, 36 files would be left unchanged.
lint: exit 1 (2.52 seconds) /home/runner/work/avro/avro/lang/py> black --check . pid=3003
  lint: FAIL code 1 (9.68=setup[6.91]+cmd[0.25,2.52] seconds)
  evaluation failed :( (9.71 seconds)
```

Reformatted the code by temporary removing `check` in `black check .` in tox.ini, running `./build.sh lint`, restore `check`

Author: martin-g

lang/py/avro/__main__.py

@@ -17,6 +17,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Command line utility for reading and writing Avro files."""
+
 import argparse
 import csv
 import functools

lang/py/avro/constants.py

@@ -19,7 +19,6 @@
 
 """Contains Constants for Python Avro"""
 
-
 DATE = "date"
 DECIMAL = "decimal"
 TIMESTAMP_MICROS = "timestamp-micros"

lang/py/avro/datafile.py

@@ -22,6 +22,7 @@
 
 https://avro.apache.org/docs/current/spec.html#Object+Container+Files
 """
+
 import io
 import json
 import warnings

lang/py/avro/name.py

@@ -18,6 +18,7 @@
 # limitations under the License.
 
 """Contains the Name classes."""
+
 from typing import TYPE_CHECKING, Dict, Optional
 
 from avro.constants import PRIMITIVE_TYPES

lang/py/avro/test/test_schema.py

@@ -745,8 +745,7 @@ class TestMisc(unittest.TestCase):
 
     def test_correct_recursive_extraction(self):
         """A recursive reference within a schema should be the same type every time."""
-        s = avro.schema.parse(
-            """{
+        s = avro.schema.parse("""{
             "type": "record",
             "name": "X",
             "fields": [{
@@ -756,8 +755,7 @@ def test_correct_recursive_extraction(self):
                     "name": "Y",
                     "fields": [{"name": "Z", "type": "X"}]}
             }]
-        }"""
-        )
+        }""")
         t = avro.schema.parse(str(s.fields[0].type))
         # If we've made it this far, the subschema was reasonably stringified; it ccould be reparsed.
         self.assertEqual("X", t.fields[0].type.name)
@@ -1186,12 +1184,10 @@ def test_whitespace(self):
         """
         Eliminate all whitespace in JSON outside of string literals.
         """
-        s = avro.schema.parse(
-            """{"type": "fixed",
+        s = avro.schema.parse("""{"type": "fixed",
             "size": 16,
             "name": "md5"}
-                """
-        )
+                """)
         self.assertEqual(
             s.canonical_form,
             self.compact_json_string({"name": "md5", "type": "fixed", "size": 16}),
@@ -1270,8 +1266,7 @@ def test_union(self):
         self.assertEqual(s.canonical_form, '["string","null","long"]')
 
     def test_large_record_handshake_request(self):
-        s = avro.schema.parse(
-            """
+        s = avro.schema.parse("""
             {
             "type": "record",
             "name": "HandshakeRequest",
@@ -1289,8 +1284,7 @@ def test_large_record_handshake_request(self):
                 }
             ]
             }
-            """
-        )
+            """)
         self.assertEqual(
             s.canonical_form,
             (
@@ -1303,8 +1297,7 @@ def test_large_record_handshake_request(self):
         )
 
     def test_large_record_handshake_response(self):
-        s = avro.schema.parse(
-            """
+        s = avro.schema.parse("""
             {
             "type": "record",
             "name": "HandshakeResponse",
@@ -1327,8 +1320,7 @@ def test_large_record_handshake_response(self):
                 "name": "meta",
                 "type": ["null", {"type": "map", "values": "bytes"}]}]
                 }
-            """
-        )
+            """)
         self.assertEqual(
             s.canonical_form,
             (
@@ -1343,8 +1335,7 @@ def test_large_record_handshake_response(self):
         )
 
     def test_large_record_interop(self):
-        s = avro.schema.parse(
-            """
+        s = avro.schema.parse("""
             {
             "type": "record",
             "name": "Interop",
@@ -1391,8 +1382,7 @@ def test_large_record_interop(self):
                 }
             ]
             }
-            """
-        )
+            """)
         self.assertEqual(
             s.canonical_form,
             (