Update tensorflow requirement from <=2.16.0 to <=2.20.0

Updates the requirements on [tensorflow](https://github.com/tensorflow/tensorflow) to permit the latest version.
- [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/tflite-v0.1.7...v2.20.0)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-version: 2.20.0
  dependency-type: direct:production
...

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

pyproject.toml

@@ -39,7 +39,7 @@ dependencies = [
     "retina_face",
     "setuptools",
     "spacy",
-    "tensorflow<=2.16.0",
+    "tensorflow<=2.20.0",
     "tf-keras",
     "tqdm",
     "webcolors",