Update prometheus-adapter go patch version to 1.20.7

[jaybooth4]

Upgrade to 1.20.7 to address multiple security vulnerabilities:
CVE-2023-29404
CVE-2023-29402
CVE-2023-29405
CVE-2023-29403
CVE-2023-39533
CVE-2023-29409
CVE-2023-29406

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[k8s-ci-robot]

Hi @jaybooth4. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: jaybooth4 / name: Jason Booth (6a1ba321dae46949cf8b7a498c857e482c214cfb)

[jaybooth4]

/check-cla

[jaybooth4]

/test all

[k8s-ci-robot]

@jaybooth4: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/kubernetes-sigs/prometheus-adapter/pull/606#issuecomment-1708319055): >/test all Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[jaybooth4]

/assign

[jaybooth4]

/unassign

[dgrisonnet]

/triage accepted /assign

[dgrisonnet]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgrisonnet, jaybooth4

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/prometheus-adapter/blob/master/OWNERS)~~ [dgrisonnet] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment