[FEATURE] v0.13 Bump Tekton and Kubernetes dependencies

[SaschaSchwarze0]

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For the v0.13 release, we should bump the Tekton and Kubernetes dependencies as usual.

Describe the solution that you would like.

Kubernetes 1.26 goes eol on 2/28.. We should therefore bump go.mod to the newest v0.27 version, and controller-runtime to the newest v0.15 version. In integration and e2e, we should test Kubernetes 1.27 and 1.29. Support statement should be adjusted to state that we support 1.27, 1.28, and 1.29.

The oldest still supported Tekton LTS release is v0.47, but it goes EOL on 3/17. I therefore suggest to bump go.mod to v0.50 (the next LTS release). In integration and e2e, I suggest to also test this version. We document v0.50 to be the minimum supported version.

Describe alternatives you have considered.

No response

Anything else?

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