Build: Bump pyiceberg-core from 0.5.1 to 0.6.0 (#2275)

Bumps [pyiceberg-core](https://rust.iceberg.apache.org) from 0.5.1 to
0.6.0.


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poetry.lock

@@ -82,7 +82,7 @@ sqlalchemy = { version = "^2.0.18", optional = true }
 bodo = { version = ">=2025.7.4", optional = true }
 daft = { version = ">=0.5.0", optional = true }
 cachetools = ">=5.5,<7.0"
-pyiceberg-core = { version = "^0.5.1", optional = true }
+pyiceberg-core = { version = ">=0.5.1,<0.7.0", optional = true }
 polars = { version = "^1.21.0", optional = true }
 thrift-sasl = { version = ">=0.4.3", optional = true }
 kerberos = {version = "^1.3.1", optional = true}