[Snyk] Security upgrade tensorflow/tensorflow from 2.7.1 to 2.9.0rc2

[indico-devops-sa]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• docker/Dockerfile.cpu

We recommend upgrading to tensorflow/tensorflow:2.9.0rc2, as this image has only 33 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	586	CVE-2022-22576 SNYK-UBUNTU2004-CURL-2804943	No Known Exploit
	633	CVE-2022-27774 SNYK-UBUNTU2004-CURL-2804961	No Known Exploit
	614	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-UBUNTU2004-OPENSSL-2426343	No Known Exploit
	514	CVE-2021-3995 SNYK-UBUNTU2004-UTILLINUX-2387728	No Known Exploit
	514	CVE-2022-1271 SNYK-UBUNTU2004-XZUTILS-2442551	No Known Exploit

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