DuckDB Spark API is incompatible with the PySpark API's `spark.createDataFrame(list of dict)`

### What happens?

The DuckDB Spark API is incompatible with the PySpark API's `spark.createDataFrame(list of dict)` method.

### To Reproduce

```python
from duckdb.experimental.spark.sql import SparkSession as DuckdbSparkSession
from pyspark.sql import SparkSession

sql_text = "SELECT * FROM t0"
data = [
{"c0": "1969-12-21"}
]
spark = SparkSession.builder.getOrCreate()
df = spark.createDataFrame(data)
df.createOrReplaceTempView("t0")

print("PySpark SQL result:")
pyspark_result = spark.sql(sql_text)
pyspark_result.show()

duckdb_spark = DuckdbSparkSession.builder.getOrCreate()
df = duckdb_spark.createDataFrame(data)
df.createOrReplaceTempView("t0")

print("Duckdb Spark SQL result: ")
duckdb_spark_result = duckdb_spark.sql(sql_text)
duckdb_spark_result.show()
```
```bash
PySpark SQL result:
+----------+
| c0|
+----------+
|1969-12-21|
+----------+

Duckdb Spark SQL result:
┌─────────┐
│ col0 │
│ varchar │
├─────────┤
│ c0 │
└─────────┘
```

### OS:

x86_64 Ubuntu 24.04 Linux-6.14.0-35-generic-x86_64-with-glibc2.39

### DuckDB Version:

1.4.2

### DuckDB Client:

Python

### Hardware:

_No response_

### Full Name:

asddfl

### Affiliation:

xxx

### Did you include all relevant configuration (e.g., CPU architecture, Linux distribution) to reproduce the issue?

- [x] Yes, I have

### Did you include all code required to reproduce the issue?

- [x] Yes, I have

### Did you include all relevant data sets for reproducing the issue?

Yes

duckdb.experimental.spark.sql.SparkSession.createDataFrame から開始し、提供された Python の再現コードを DuckDB Spark API と PySpark に対して実行します。一時ビューの結果出力を比較し、辞書のリストに対して DuckDB が PySpark と同じ列名と行の値を生成した時点で issue は完了とします。

索引モデルが issue の本文から書いたものです。