Change tf-nightly to tensorflow to avoid import error.

PiperOrigin-RevId: 352363509

Author: lintian06

tensorflow_examples/lite/model_maker/requirements_nightly.txt

@@ -1,5 +1,5 @@
-# TODO(b/177629432): Change to tf-models-nightly once NotFoundError is fixed
-# with tensorflow-text-nightly.
+# TODO(b/177629432): Change to tf-models-nightly and tensorflow once
+# NotFoundError is fixed with tensorflow-text-nightly.
 tf-models-official>=2.4.0
 tf-hub-nightly
 numpy>=1.17.3
@@ -11,7 +11,7 @@ flatbuffers==1.12
 absl-py<0.11>=0.10.0
 urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1
 tflite-support-nightly
-tf-nightly
+tensorflow>=2.4.0
 librosa>=0.5
 lxml>=4.6.1
 PyYAML>=5.1