chore: update CHANGELOG.md and version file to 2.2.1 for argilla project

Author: jfcalvo

argilla/CHANGELOG.md

@@ -16,6 +16,8 @@ These are the section headers that we use:
 
 ## [Unreleased]()
 
+## [2.2.1](https://github.com/argilla-io/argilla/compare/v2.2.0...v2.2.1)
+
 ### Fixed
 
 - Fixed `from_hub` errors when columns names contain uppercase letters. ([#5523](https://github.com/argilla-io/argilla/pull/5523))

argilla/src/argilla/_version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2.2.0"
+__version__ = "2.2.1"