Bump tensorflow-hub from 0.7.0 to 0.8.0

Bumps [tensorflow-hub](https://github.com/tensorflow/hub) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/tensorflow/hub/releases)
- [Changelog](https://github.com/tensorflow/hub/blob/master/RELEASE.md)
- [Commits](tensorflow/hub@v0.7.0...v0.8.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

poetry.lock

@@ -115,7 +115,7 @@ psycopg2-binary = "~2.8.2"
 PyJWT = "~1.7"
 python-dateutil = "~2.8"
 tensorflow = "~2.1"
-tensorflow_hub = "~0.7"
+tensorflow_hub = ">=0.7,<0.9"
 tensorflow-addons = "^0.7.1"
 tensorflow-estimator = "2.1.0"
 tensorflow-probability = ">=0.7,<0.10"