build(deps-dev): update tensorflow-cpu requirement

Updates the requirements on [tensorflow-cpu](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](tensorflow/tensorflow@v2.18.0...v2.20.0)

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

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Author: dependabot[bot]

pyproject.toml

@@ -162,7 +162,7 @@ dev = [
 pin_tensorflow_cpu = [
   # https://github.com/tensorflow/tensorflow/issues/75279
   # macos x86 has been deprecated
-  "tensorflow-cpu~=2.18.0; platform_machine=='x86_64' and platform_system == 'Linux'",
+  "tensorflow-cpu>=2.18,<2.21; platform_machine=='x86_64' and platform_system == 'Linux'",
   "tensorflow~=2.18.0; (platform_machine!='x86_64' or platform_system != 'Linux') and (platform_machine!='x86_64' or platform_system != 'Darwin')",
   "tensorflow; platform_machine=='x86_64' and platform_system == 'Darwin'",
 ]