chore(deps): update docker.io/library/ubuntu docker tag to v20.10

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/ubuntu	final	minor	20.04 -> 20.10

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[jibi]

the iptables-20.04 image was specifically based on ubuntu 20.04 as that's what was needed to build iptables 1.8.8 for v1.13. No value in updating it to 20.10 as we risk breaking the build dependencies (and we won't need this anymore soon, once v1.13 is EOL). Closing

[renovate]

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