Increment c4 version

PiperOrigin-RevId: 296026763

Author: Conchylicultor

tensorflow_datasets/text/c4.py

@@ -47,9 +47,10 @@
   eprint = {1910.10683},
 }
 """
-_VERSION = tfds.core.Version("2.2.0")
+_VERSION = tfds.core.Version("2.2.1", "Update dataset_info.json")
 
 _SUPPORTED_VERSIONS = [
+    tfds.core.Version("2.2.0"),
     tfds.core.Version(
         "1.1.0", experiments={tfds.core.Experiment.S3: False},
         tfds_version_to_prepare="42f5bf89efcfd2cd165c2511b22be49cb1a50856"),