Error when upserting and updating dataframes with dictionary encoded columns

### Apache Iceberg version

0.9.1

### Please describe the bug 🐞

df = pyarrow.read_table(read_dictionary=[string_columns])

table = catalog.load_table(table_name)

table.append(df) -> 'append' casts dictionary columns into large string and table appended without any error

table.upsert(df, join_cols=[primary_keys]) -> Error (Invalid Type Dictionary)
table.update(df, join_cols=[primary_keys]) -> Error (Invalid Type Dictionary)

### Willingness to contribute

- [ ] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from the Iceberg community
- [x] I cannot contribute a fix for this bug at this time

Inizia riproducendo il problema con pyarrow.read_table(read_dictionary=[string_columns]) e una tabella caricata da catalog.load_table(table_name). Confronta table.append(df), table.upsert(df, join_cols=[primary_keys]) e table.update(df, join_cols=[primary_keys]); il lavoro è completato quando upsert e update gestiscono le colonne codificate come dictionary senza l'errore Invalid Type Dictionary segnalato.

Scritto dal modello di indicizzazione a partire dal testo della issue.