Build: Bump pyiceberg-core from 0.5.1 to 0.6.0

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

---
updated-dependencies:
- dependency-name: pyiceberg-core
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -81,7 +81,7 @@ 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}