Bump tensorflow from 2.4.1 to 2.5.1

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.4.1 to 2.5.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v2.4.1...v2.5.1)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
...

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setup.py

@@ -76,7 +76,7 @@ setup_requires = []
 
 install_requires = [
     'numpy>=1.19.5',
-    'tensorflow==2.4.1',
+    'tensorflow==2.5.1',
     'keras==2.4.3',
     'mtcnn',
     'pillow>=7.0.0',