Bump versions of dependencies

[Raffo]

This PR bumps most dependencies to recent versions. It is needed to pave the path to kubernetes 1.22 and reduce 10 vulnerabilities that can be found today in the ExternalDNS binary.

This included:

• remove the dependency on kubernetes the main repo: we should never depend on that one.
• remove unsupported countour APIs.
• bump to a much newer etcd library.
• adjust for azure deprecated methods.
• fixed CodeQL to account for a strict go 1.16 requirement.

Before I squash the commits, I would love to understand if this makes sense to other people, especially @njuettner .

[abursavich]

I don't have a problem with this PR, but I wanted to offer some context on an alternative. I worked on roughly the same problem a few weeks ago (#2045 (comment)), but after fixing breakages to the fake dynamic clients in tests I was still worried that there may be similar breakages to the real dynamic clients. I ended up replacing all of the dynamic clients with generated static clients and have been submitting small PRs building up to it.

You can check out all of my remaining changes, including adding the Gateway API sources, but looking at the whole thing in one shot might be a little overwhelming. It's logically broken up into smaller chunks for PRs that do one thing at a time (e.g. gloo, contour, ambassador, etcd, kong, gateway, skipper).

From my side I just needed upgraded k8s dependencies, so I'm happy to have that either way.

[njuettner]

/lgtm

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